Looking to put an ugly April behind him, Andrew McCutchen's bat has emerged, but the knee issue is putting his stolen base totals at risk. Plus, Matt Carpenter, Christian Yelich, Gio Gonzalez, and Jeremy Hellickson.

Starling Marte has already nearly matched his HR total from 2014. Can he keep it up? Plus Tyson Ross, Neil Walker, Francisco Liriano and Brandon Phillips.

Shin-Soo Choo cost the Rangers serious coin, but hasn't really produced—until May. Can his hot streak continue? Also Richards, Morales, Dickey, and Gattis.

Kolten Wong has been one of the top 2B early on in 2015, and he's not even 25. Is he a star in the making? Plus Michael Wacha, Khris Davis, Jason Hammel, and Freddy Galvis.

Kole Calhoun has been a quality offensive producer, but is there more upside or downside in his future?

Carlos Carrasco tries to build on his '14 breakout. Plus George Springer, Nick Martinez, Mookie Betts and Brett Lawrie.

Bryce Harper is on an absolute tear, and looks to be fulfilling the promise that was expected out of him since he was drafted first overall in 2010. Plus, Daniel Murphy, Brayan Pena, David Phelps, and Kyle Lohse.

Jon Lester hasn't performed up to expectations thus far. Is there reason for concern? Plus Charlie Blackmon, Jimmy Rollins, A.J. Burnett, and Matt Adams.

Can Mike Napoli turn around his slow start and help the Red Sox make a push for the pennant? Also Tillman, Reddick, Simon, and Joyce.

After putting up the best skills of any hitter in 2014, Victor Martinez has floundered this season. Is a knee injury to blame? Plus Chris Archer, Stephen Vogt, Danny Duffy, and Avisail Garcia.

Rubby De La Rosa quietly is starting to show signs of turning his electric raw stuff into skills and results. Further gains against LH bats could help him become a rotation anchor.