If you follow our Prospect Report annually, you might recall one of the favorite mid-August mantras: September call-ups always seem intriguing, but they are notoriously overrated. It is a function of a few factors:

  1. A lot of the elite guys arrive just before Aug. 31, if they are going to come up at all.
  2. Call-ups aren't always slotted with rotation spots or everyday jobs during the roster expansion period.
  3. September call-ups have little or no major league experience and not all rookies are instant hits.

We still have to keep you on top of the potential September call-ups, though. Most of the more intriguing guys below will arrive before Aug. 31.

But here are our top 10 potential impact Fantasy call-ups here on out:

1. Travis Snider, OF, Blue Jays -- .325 average, 13 homers, 37 RBI, 31 runs, two steals (.421 on-base percentage, .650 slugging percentage) in 163 Triple-A at-bats

When the Blue Jays gave away Alex Rios and his old-market contract, everyone assumed it was to give Snider his return ticket to Toronto. Nope. Instead, journeyman minor league Randy Ruiz got the call and homered in each of his first two games.

Snider, who allegedly is being held back until after Aug. 20 to keep him from being a Super Two, shouldn't take long to arrive in the next week-plus. Super Two is the term for a player who is arbitration eligible after his second full season because of extended service time back in his rookie season.

Snider has hit .435 in August with six homers back in Triple-A, proving he belongs back in the Blue Jays every day lineup. Ruiz won't be holding this 21-year-old talent back.

2. Chris Davis, 1B, Rangers -- .321-6-25-21-0 (.409-.542) in 131 Triple-A at-bats

Davis was sent back to the minors because of a ridiculous 114 strikeouts in 258 at-bats with the Rangers earlier this season. He cut his strikeout rate and raised his walk rate nicely back in the minors and deserves a recall as soon as the Rangers find a spot to fit him in amid the pennant race. At the very least, he will be a September call-up for spot duty.

When he was sent back to the minors, he was going to share time with 2008 first-round pick Justin Smoak, who rose from Double-A and was seemingly headed in the opposite direction of Davis. Smoak has struggled in Triple-A (.220) and clearly won't be the impact Fantasy player down the stretch we already know Davis can be.

3. Madison Bumgarner, SP, Giants -- 10-2, 1.97 ERA, .219 batting-average against, 82 strikeouts, 28 walks in 105 1/3 innings between high Class A and Double-A

Baseball America lists Bumgarner as the best pitching prospect in the minor leagues right now, but they knock him for his overuse of the fastball and the lack of developing secondary pitches. It is tough to develop secondary pitches when the high-90s heat gets the job done on its own against weaker competition.

Bumgarner is a 20-year-old lefty who needs a challenge, and the Giants are a contender that could use a better No. 5 starter. Kevin Pucetas, a 25-year-old Triple-A ace (10-3, 3.74, .256, 84, 43 in 138 2/3 innings) likely will get a look first, but Bumgarner is the pitching prospect call-up to really be anxious about.

4. Matt LaPorta, 1B, Indians -- .297-15-57-58-1 (.379-.519) in 320 Triple-A at-bats

The Indians cleared out 1B/OF Ryan Garko, C/1B Victor Martinez and OF Ben Francisco before the trade deadline and still haven't gone back to the key piece from the CC Sabathia deal of a year ago, LaPorta. It isn't because of anything LaPorta has or hasn't done back in the minors.

LaPorta struggled to hit just .190 in his first 42 at-bats, but clearly they need to take a longer look at him for the future down the stretch. LaPorta has been hot in recent days, hitting two homers in his past three games. He should arrive before Sept. 1.

5. Brandon Morrow, SP, Mariners -- (1-2)-5.40-.296-25-14 in 26 2/3 Triple-A innings

Morrow's overall minor league numbers lead you to realize why he is still back in the minors stretching out as a full-time starter. A look at his past two outings tell a different story: three earned runs in 13 innings with 13 strikeouts and just two walks.

The Mariners don't really need a reason to recall Morrow to their rotation, but he is giving them many now anyway. Morrow is eligible at RP and SP in CBSSports.com leagues this season, so he gets a boost in value for his versatility, too.

If you are looking for potential call-up dates, look to his five-day starting schedule going forward: Aug. 13, Aug. 18, Aug. 23, Aug. 28. He could arrive any of those final three.

6. Andrew Miller, SP, Marlins -- (0-2)-6.89-.246-18-14 in 15 2/3 innings between high Class A, Double and Triple-A

Miller's numbers look awful and he is an even bigger question mark because he is on the 7-day DL with an ankle injury. Miller is throwing off a mound again, though, and should be able to get himself ready for a September return.

Miller is as erratic as any of the erratic lefties, especially the young ones, but his talent still is there and he could string some decent starts together down the stretch for the Marlins and Fantasy owners. He will be risky initially, but a patient owner could get some value out of him before season's end.

7. Brandon Wood, 3B, Angels -- .303-20-59-53-1 (.360-.584) in 320 Triple-A at-bats

You have to be sick of seeing this name in this space. We trumpet Wood's potential impact for Fantasy leagues and are always left disappointed.

We are not convinced we won't be again, but his talent and power make him someone to not lose track of. The Angels most certainly will have him on their roster after his Triple-A season ends.

If he can finally get hot in the majors -- perhaps post a stretch like Jeff Baker did in September 2006 (.375-5-21-13-2) -- Wood could earn regular at-bats for the already offensively potent Angels. He can be a clutch Fantasy crunch time addition, especially since he is eligible at shortstop, too.

8. Jason Heyward, OF, Braves -- .333-16-55-60-5 (.411-.591) in 303 at-bats between high Class A and Double-A

The Braves have been taking a look at their top prospect in Double-A recently and they have to be impressed. Even if he is just 20 years old, he has to be more intriguing than Ryan Church, right?

Heyward deserves a September call-up, even if his age suggests he should be a candidate for the instructional league. This is a big-time talent rising quickly. His development this season has to be the reason they cut bait on Jeff Francoeur in that deal with the Mets.

9. Brett Wallace, 3B, Athletics -- .283-13-45-57-0 (.358-.424)

By all scouting reports, Wallace is going to be a big-time hitter. We weren't that impressed in spring training with the Cardinals, though, especially with a body that makes him look like a mini Prince Fielder. Well, technically not mini, but you might get the idea.

The A's key piece in the Matt Holliday trade would be getting rushed along to the majors in his first full pro season, but there isn't much blocking him in Oakland right now -- especially if they are inclined to keep him at third base.

We figure his primary impact will merely come in AL-only leagues in September.

10. Cameron Maybin, OF, Marlins -- .328-3-31-36-7 (.415-.471) in 244 Triple-A at-bats

Maybin has been a bit of a bust thus far. He was supposed to be a future 30-30 candidate in the major leagues. He is hitting on a 10-20 pace back in Triple-A. The good news is he has improved his problematic strikeout-to-walk rate in the minors: 47-34.

The Marlins could use an offensive spark, but we still are not convinced Maybin is it. He is every bit as talented as an Andrew McCutchen, but his results haven't been there on that level yet. He has proven to be more of a Lastings Milledge, minus the off-the-field questions. Long term, it was thought he could be an elite outfielder, but every day that passes suggests he will be more like a Mike Cameron.

The list of potential call-ups doesn't end here, so watch the status of any of the most-owned minor leaguers below and those that block them.

Prospect watch

Every week we break down all the minor leaguers who are owned in at least 1 percent of our Fantasy leagues. This will be your essential guide to unearthing the elite prospects before they hit the big time.

CBSSports.com most-owned minor leaguers
Player POS TM % Player POS TM % Player POS TM %
J.J. Hardy SS MIL 64 Chris Marrero OF WAS 3 Danny Valencia 3B MIN 1
Chris Davis 3B TEX 44 Matt Antonelli 2B SD 3 Cody Ransom 1B NYY 1
Chris B. Young CF ARI 34 Jake McGee SP TB 3 Felipe Paulino SP HOU 1
John Smoltz SP BOS 29 Tyler Flowers C CHW 3 Michael Brantley OF CLE 1
Travis Snider OF TOR 28 Phillippe Aumont SP SEA 3 Conor M. Gillaspie 3B SF 1
Brandon Morrow SP SEA 26 Hector Rondon SP CLE 3 Andrew Lambo LF LA 1
Matt LaPorta OF CLE 26 Ross Detwiler SP WAS 2 Brett Sinkbeil SP FLA 1
Madison Bumgarner SP SF 21 Charles Lofgren SP CLE 2 Joe Mather LF STL 1
Cameron Maybin CF FLA 21 Troy Patton SP BAL 2 Kasey Kiker SP TEX 1
Brandon Wood 3B ANA 17 Brad Lincoln SP PIT 2 Josh Geer SP SD 1
Vicente Padilla SP TEX 15 Wilmer Flores SS NYM 2 Bradley Holt SP NYM 1
Mat Gamel 3B MIL 15 Ian Kennedy SP NYY 2 Tyler Colvin LF CHC 1
Andy Sonnanstine SP TB 15 Chad Cordero RP SEA 2 David Cooper 1B TOR 1
Buster Posey C SF 14 Jemile Weeks 2B OAK 2 Wes Hodges 3B CLE 1
Justin Smoak 1B TEX 13 Chris Heisey CF CIN 2 Ryan Shealy 1B KC 1
Jason Heyward OF ATL 13 Drew Stubbs OF CIN 2 Chin-lung Hu SS LA 1
Pedro Alvarez 3B PIT 12 Hank Conger C ANA 2 Brian N. Anderson CF BOS 1
Andrew Miller SP FLA 12 Adam Miller SP CLE 2 Barbaro Canizares OF ATL 1
Brett Wallace 3B OAK 10 Walter Silva RP SD 2 Jason Knapp SP CLE 1
Chris Duncan 1B BOS 9 Lou Marson C CLE 2 Mark Melancon RP NYY 1
Josh D. Fields 3B CHW 9 Daniel Cabrera SP ARI 2 Cole Rohrbough SP ATL 1
Carlos Carrasco SP CLE 9 Brett Lawrie C MIL 2 Alex Liddi 3B SEA 1
Lars Anderson 1B BOS 8 Todd Frazier SS CIN 2 Jo-Jo Reyes SP ATL 1
Michael Bowden SP BOS 8 Jordan Walden SP ANA 2 Ryan Kalish OF BOS 1
Jordan Schafer OF ATL 8 Blake DeWitt 2B LA 2 Mark Trumbo 1B ANA 1
Wade Davis SP TB 8 Chris Valaika SS CIN 2 Brent Lillibridge SS CHW 1
Aaron Poreda SP SD 8 Andrew Brackman SP NYY 2 Gorkys Hernandez CF PIT 1
Jeff Clement C PIT 8 Brandon Allen OF ARI 2 Kyle Kendrick SP PHI 1
Carlos Santana C CLE 8 Greg Halman OF SEA 2 Chris Nelson SS COL 1
Jarrod Parker SP ARI 7 David Freese 3B STL 2 Henry A. Rodriguez SP OAK 1
Jake Arrieta SP BAL 7 Christian Friedrich SP COL 2 Rodrigo Lopez SP PHI 1
Austin Jackson OF NYY 7 Jason Castro C HOU 2 Jesus Guzman 3B SF 1
Jhoulys Chacin SP COL 7 Adrian Cardenas SS OAK 2 Michael Main SP TEX 1
Michael Stanton OF FLA 7 Martin Perez SP TEX 2 Humberto Sanchez RP NYY 1
Michael Moustakas 3B KC 6 Jason Donald SS CLE 2 Deolis Guerra SP MIN 1
Tim Beckham SS TB 6 Sean Gallagher SP SD 2 Eric Patterson 2B OAK 1
Kyle Drabek SP PHI 6 Beau Mills 1B CLE 2 Greg Smith SP COL 1
Emmanuel Burriss SS SF 6 Ben Revere CF MIN 2 Casey Weathers RP COL 1
Desmond Jennings OF TB 6 Scott Sizemore SS DET 1 Casey Janssen RP TOR 1
Josh Vitters 3B CHC 6 Joe Koshansky 1B MIL 1 Alfredo Figaro SP DET 1
Timothy Alderson SP PIT 6 Carlos Torres RP CHW 1 Daryl Jones CF STL 1
Jesus Montero C NYY 6 Will Inman SP SD 1 Daniel Hudson SP CHW 1
Dayan Viciedo 3B CHW 5 Dellin Betances SP NYY 1 Fautino De Los Santos RP OAK 1
Gaby Sanchez 1B FLA 5 William Rowell 3B BAL 1 Brandon Erbe SP BAL 1
Dana Eveland SP OAK 5 Ethan Martin SP LA 1 Derek Norris C WAS 1
Sean Rodriguez 2B ANA 5 Matt Maloney SP CIN 1 Brad Mills RP TOR 1
Yonder Alonso 1B CIN 5 J.R. Towles C HOU 1 Matt Tuiasosopo 3B SEA 1
Logan Morrison 1B FLA 5 Wilkin Ramirez OF DET 1 Brandon Backe SP HOU 1
Ryan Sadowski SP SF 5 Kevin Pucetas SP SF 1 Cory Wade RP LA 1
Jeanmar Gomez SP CLE 4 Josh D. Fields RP SEA 1 Nicholas Weglarz 1B CLE 1
David Purcey SP TOR 4 Joshua Bell 3B BAL 1 Sean Doolittle 1B OAK 1
Shairon Martis SP WAS 4 Kyle Skipworth C FLA 1 Jeremy Jeffress SP MIL 1
Michael Taylor LF PHI 4 Radhames Liz SP BAL 1 John Bowker 1B SF 1
Scott Elbert RP LA 4 Joe Nelson RP TB 1 Bryan D. Anderson C STL 1
Kila Ka'aihue DH KC 4 Cedric Hunter CF SD 1 Engel Beltre OF TEX 1
Jason M. Vargas SP SEA 4 Justin Maxwell CF WAS 1 Jose Ceda RP FLA 1
Jeremy Hellickson SP TB 4 Brandon Jones LF ATL 1 Jeff Larish DH DET 1
Matt Joyce OF TB 4 Brandon Snyder 1B BAL 1 Isaac Davis 1B NYM 1
J.P. Arencibia C TOR 4 Wilson Ramos C MIN 1 Wilson Betemit 1B CHW 1
Reid Brignac SS TB 4 Jeremy Accardo RP TOR 1 Joe Savery SP PHI 1
Eric O. Young 2B COL 4 Wilin Rosario C COL 1 Reese Havens SS NYM 1
Chris C. Carter 1B OAK 4 Ivan DeJesus SS LA 1 Ryan Tucker SP FLA 1
Eric Hosmer 1B KC 4 Austin Romine C NYY 1 Chris C. Carter DH BOS 1
Angel Villalona 3B SF 4 Joshua Lindblom P LA 1 Andrew Cashner SP CHC 1
Michael Ynoa SP OAK 3 Tim Dillard RP MIL 1 Trevor Reckling RP ANA 1
Micah Hoffpauir OF CHC 3 Freddy An. Garcia SP CHW 1 Virgil Vasquez SP PIT 1
Eric Stults SP LA 3 Daniel Moskos SP PIT 1 Juan Francisco 3B CIN 1
Carlos Triunfel SS SEA 3 Jenrry Mejia SP NYM 1 Nick Evans LF NYM 1
Freddie Freeman 1B ATL 3 Michael Burgess RF WAS 1 Wade LeBlanc SP SD 1
Juan Cruz RP KC 3 Kevin Mulvey SP MIN 1 Casey Kelly SS BOS 1
Angel Salome C MIL 3 Dallas McPherson 3B SF 1 Travis Buck RF OAK 1
Jose Tabata OF PIT 3 Jordan Danks CF CHW 1 John Mayberry OF PHI 1
Dominic Brown OF PHI 3 Neil Walker 3B PIT 1 Mike Carp 1B SEA 1
Aaron Hicks OF MIN 3 Jon Meloan RP PIT 1 Nicholas Noonan SS SF 1
Max Ramirez C TEX 3 Lonnie Chisenhall 3B CLE 1
Matt Dominguez 3B FLA 3 Brian Barden 3B STL 1

Rookie watch

Top AL rookies to date

1. Gordon Beckham, 3B, CHW -- He is hitting over .300 with 40 RBI in just over 1/3 of a full season, holding off double-digit win starters.
2. Jeff Niemann, SP, TB -- The Rays aren't quite as good as last season, but he is not the reason. He has outpitched his elite left-handed teammate.
3. Andrew Bailey, RP, OAK -- His numbers make him a solid start in all mixed leagues every week, unlike the sinking 10-win starters below.
4. Ricky Romero, SP, TOR -- It will be real interesting to see which AL rookie starter finishes with the most wins. He has won 10 of 18 starts. Wow.
5. Rick Porcello, SP, DET -- The contender he pitches for makes him intriguing, but his innings total this season is a bit scary for the stretch run. Honorable mentions: Nolan Reimold, OF, BAL; Elvis Andrus, SS, TEX; Brett Anderson, SP, OAK; Matt Wieters, C, BAL; Brad Bergesen, SP, BAL; Neftali Feliz, RP, TEX; David Hernandez, SP, BAL; Alfredo Aceves, RP, NYY; Tommy Hunter, SP, TEX; David Price, SP, TB; Derek Holland, SP, TEX; Matt Palmer, RP, LAA; Scott Richmond, SP, TOR; Chris Getz, 2B, CHW.

Top NL rookies to date

1. J.A. Happ, SP, PHI -- It will be a real interesting race down the stretch between NL East rookie starting pitchers; Happ leads now, but ...
2. Tommy Hanson, SP, ATL -- He has surpassed his career high in innings, but he is so good even a tired arm is good enough to star.
3. Andrew McCutchen, OF, PIT -- He has been far better than we expected this early. The Pirates look like geniuses for calling on him when they did.
4. Randy Wells, SP, CHC -- The converted reliever has arguably been the Cubs' best starter; we don't see a long-term talent, though.
5. Chris Coghlan, OF, FLA -- His numbers would play a lot more nicely in the infield, but a serious hot streak makes him a solid option in mixed leagues now. Honorable mentions: Casey McGehee, 3B, MIL; Gerardo Parra, OF, ARI; Garrett Jones, OF, PIT; Bud Norris, SP, HOU; Colby Rasmus, OF, STL; Omir Santos, C, NYM; Will Venable, OF, SD; Dexter Fowler, OF, COL; Jake Fox, C, CHC; Dan L. Meyer, RP, FLA; Mat Latos, SP, SD; Bobby Parnell, RP, NYM; Travis Ishikawa, 1B, SF; Everth Cabrera, SS, SD; and Kenshin Kawakami, SP, ATL.

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