Ian Happ is not slowing down. I wrote about him on Monday and mentioned that Joe Maddon seemed to leave the door open for Happ's promotion to be a permanent one. So far the Cubs' rookie has played three games and he has four hits, including two that left the park. He's done so while playing exclusively in the outfield, so he's about to be dual eligible as well. 

Happ is still 58 percent owned and this beginning to feel more and more like a Cody Bellinger situation. Like the Dodgers, the Cubs have a bunch of pieces but Maddon is not going to send Happ back down with the way he's going and the way this season has started. If he keeps hitting the Cubs will keep finding playing time for him on a regular basis. They don't even have to make a decision until Jason Heyward comes back and someone else could be hurt by then.

It won't be long before Happ is owned in all of your leagues, so drop one of the replaceable parts on your bench and go get him.

Happ wasn't the only prospect making news, with Bradley Zimmer making his major league debut. Scott White wrote extensively about Zimmer here, but I'll give you the cliff notes version. Zimmer has it all; power, speed and some serious contact issues. He's a must-add in a five outfielder league. In three outfielder category formats I would still take a chance on him, but I'm going to hold off in points leagues. Zimmer struck out in his first three major league at bats and I'd like to see him hit something before we add him everywhere.

Here are four more you should be adding, depending on format:

Waiver Wire
67%
Amir Garrett Cincinnati SP
Garrett is being recalled from the minors after being sent down to preserve his innings. Garrett was bombed at Miller Park but he's given up two runs or less in every other start this season. I wouldn't go so far as to say he's a must-start, but in the current pitching environment he deserves a roster spot in just about every league. 
37%
Devon Travis Toronto 2B
Travis was thought to be a breakout candidate at second base and at the very least a must-own 2B coming into the year. A dreadful start changed that, but there are signs he's broken out of his slump. Travis has seven hits in his past three games, and remarkably six of them are doubles. While his season slash line is still terrible (.205/.239/.339), he also still has a BABIP nearly 90 points below his career average. Pounce now before everyone else realizes Travis is back.
37%
JC Ramirez L.A. Angels SP
The full season numbers still don't look great for Ramirez, but he's basically had two bad starts. Ramirez has gone at least seven innings in three of his past four starts and he's only given more than two runs once in that span. The strikeouts have been inconsistent, but Ramirez has not walked more than two batters in a starts yet. As an RP-eligible starter, he's a great add for the Edwin Diaz owner. Ramirez should be owned in most points leagues, but I'm not ready to go there in a standard Rotisserie league yet. 
34%
player headshot
Domingo Santana Milwaukee RF
We wrote about Santana last week and how his peripherals looked encouraging. Since then, he's raked. For the season,  Santana now has a .279/.369/.459 slash line with a 12 percent walk rate. Yes his BABIP is high, at .358, but it's just 11 points higher than his career average and a point below 2016. Santana continues to do a good job of limiting soft contact and has cut his K rate and increased his contact rate. He should be owned in all five-outfielder leagues.