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At this time last year, Kris Bryant was already three games into his major-league career.

That's right: We've reached an important milestone -- the point at which a player could spend the rest of the season on a big-league roster without it counting as a year of service time -- yet there's no talk of a big-name prospect being on the verge of a promotion.

OK, so Henry Owens is probably coming up after Joe Kelly went on the DL with a right shoulder impingement Tuesday, and of course Nomar Mazara has already arrived (and thrived). But both were in response to injury and not cases of a team waiting out the clock to get what it always believed to be a superior player on its roster.

And I don't think Owens is a game-changer anyway. He did throw six one-hit innings in his first start for Triple-A Pawtucket earlier this year -- and his 23 strikeouts in 18 innings certainly raise an eyebrow -- but we already knew he could pitch in the minors. He still has the potential to develop into something great, but his return to the majors should be met with only slightly more fanfare than Archie Bradley's earlier in the week. Like Bradley, Owens' first stint in the majors didn't go particularly well, and his lingering control issues give him a not-so-rosy outlook.

So then who? And when? We may be waiting for a while if this first major milestone is any indication. The difficult-to-pinpoint "Super 2 deadline" could open the floodgates in late June, and as we've already seen with Mazara, an injury could move up the timetable for any prospect. But if you're stashing one expecting a worthwhile contribution in the next six weeks, you may be in for an unpleasant surprise.

That said, here are the five prospects most worth stashing, in part because of their projected timetables.

Five on the verge

(These are the prospects most worth stashing in redraft leagues.)

Trea Turner, 2B, Nationals
2015 stats: .322 BA, 8 HR, 29 SB, .828 OPS
2016 stats: .357 BA (15 for 42), 1 HR, 4 SB, .997 OPS, 7 BB, 9 K

Some news on this one: Nationals beat writer Mark Zuckerman of MASN Sports did some math and determined that because Turner spent 25 days in the big leagues last year, his critical milestones are actually early June and mid-July. Then again, the Nationals are playing for something, and their current shortstop is batting .158 while Turner just won International League Player of the Week honors. I'll be the optimist this time.

Joey Gallo, OF, Rangers
2015 stats: .240 BA, 23 HR, 51 BB, 139 K, 321 AB
2016 stats: .308 BA (12 for 39), 4 HR, 1.135 OPS, 8 BB, 10 K

No home runs in the past week for Gallo, but the more significant development is that his strikeout rate isn't a complete embarrassment. Granted, one every four at-bats still isn't great, but George Springer never had a rate that low in the minors and has turned out just fine. Gallo is no longer in the outfield mix and still behind Adrian Beltre, who just signed a two-year extension, at third base, so the most likely hint of an impending promotion may be a shift across the diamond, especially if Mitch Moreland is struggling.

A.J. Reed, 1B, Astros
2015 stats: .340 BA, 34 HR, 1.044 OPS, 86 BB, 122 K
2016 stats: .227 BA (10 for 44), 3 HR, .836 OPS, 6 BB, 11 K

Reed finally appears to have found his power stroke at Triple-A Fresno, hitting three home runs in his past six games, including this impressive opposite-field blast off a left-hander Saturday:

Of course, he's still a long way from the video game numbers he put together between two stops last year, and with Tyler White solidifying the starting first base job in the majors, Reed's going to have to force his way onto the roster. The extent of Evan Gattis' transition to catcher is something to monitor since it could open up the DH spot.

Sean Manaea, SP, Athletics
2015 stats: 7-1, 2.66 ERA, 1.25 WHIP, 74 1/3 IP, 26 BB, 90 K
2016 stats: 2-0, 1.50 ERA, 1.00 WHIP, 12 IP, 2 BB, 17 K

After striking out 11 over 6 2/3 one-run innings Saturday, Manaea looks like he's too good for Triple-A, which is notable because, well, there's only one other place he can go. Of all the prospects who didn't win a job this spring this spring, he might have moved up his timetable the most, especially now that he's building off the near miss instead of pouting about it like so many near-misses do.

"A lot of the stuff I was working on in spring training has been paying off for me so far," he told MLB.com. "Triple-A hitters are much better, much more patient [than Double-A hitters]. They make you throw fastballs for strikes, no matter what the count is. It's tough, but it makes you a better pitcher."

And throw strikes he has. If he keeps his walks down, the Athletics won't be able to keep him down much longer.

Blake Snell, SP, Rays
2015 stats: 15-4, 1.41 ERA, 1.02 WHIP, 134 IP, 53 BB, 163 K
2016 stats: 1-1, 2.51 ERA, 1.54 WHIP, 14 1/3 IP, 7 BB, 21 K

Snell was nearly unhittable between high Class A and Double-A last year, and his bat-missing ability has translated to Triple-A just fine. Unfortunately, his control problems haven't abated at all, preventing him from going more than five innings in any of his first three starts. Still, the Rays are enamored, at one point looking to sign him to a long-term deal while still in the minors, and considering they won't need a fifth starter again until May 24, he has time to get his act together.

Five on the periphery

(These are some other prospects doing something of note.)

Aaron Blair, SP, Braves
2015 stats: 13-5, 2.92 ERA, 1.17 WHIP, 160 1/3 IP, 50 BB, 120 K
2016 stats: 3-0, 1.42 ERA, 0.79 WHIP, 19 IP, 5 BB, 22 K

Blair doesn't have quite the upside of those other five, making him not so stashable in standard re-draft leagues, but he's overdue for a call-up and doesn't exactly have a pile of aces in front of him. I'm guessing his no-hit, 10-strikeout gem (over seven innings) Tuesday has the Braves reassessing their commitment to Williams Perez.

Trey Mancini, 1B, Orioles
2015 stats: .341 BA, 21 HR, 43 2B, .938 OPS, 31 BB, 93 K
2016 stats: .302 BA (13 for 43), 5 HR, 1.178 OPS, 9 BB, 14 K

Remember: Mancini was part of the first base discussion before the Orioles opted to bring back Chris Davis this offseason, so his hot start, even though just at Double-A, should put Rule 5 pick Joey Rickard on notice. Davis could possibly shift to the outfield if Mancini continues to show that his breakout 2015 wasn't a fluke.

Alex Bregman, SS, Astros
2015 stats: .294 BA (272 at-bats), 4 HR, 13 SB, .781 OPS, 29 BB, 30 K
2016 stats: .395 BA (17 for 43), 5 HR, 2 SB, 1.247 OPS, 6 BB, 3 K

The Astros made Bregman the second overall pick in last year's draft even though they already had a franchise player at both shortstop and second base, so ... now what? He's a college product showing more power than anyone would have a predicted at a level that was supposed to be a challenge for him. I wouldn't expect to see him in the majors any time soon, but not because he doesn't deserve it. (Look at that plate discipline!)

Lucas Sims, SP, Braves
2015 stats: 7-6, 4.37 ERA, 1.39 WHIP, 92 2/3 IP, 54 BB, 100 K
2016 stats: 0-2, 1.84 ERA, 1.16 WHIP, 14 2/3 IP, 10 BB, 26 K

So the Braves have spent the last couple years stockpiling their system with high-upside arms, but for all the attention given Sean Newcomb, Touki Toussaint and Blair, the one pitcher generating the most buzz right now is an old Frank Wren pick, Lucas Sim. He broke through as a power pitcher in the Arizona Fall League and has averaged 16.0 strikeouts per nine innings through three starts. He has some control issues to sort out, but his stock is most definitely up.

Mike Zunino, C, Mariners
2015 stats (majors): .174 BA, 11 HR, .530 OPS, 21 BB, 132 K
2016 stats (minors): .452 BA, 6 HR, 1.419 OPS, 2 BB, 7 K

With 961 at-bats in the majors, Zunino doesn't fit the traditional definition of "prospect," but as a 25-year-old former third overall pick, what he does in the minors still matters. And what he's doing now is homering every day and twice on Sunday. OK, so the two-homer game was actually on Monday, but you get the idea: Six home runs in six games shows he still has something to work with. Then again, so did seven home runs in 54 at-bats last spring, so I'm not caring to add him outside of AL-only leagues. If only Jack Zduriencik and company hadn't rushed him.