In recent weeks, Will Middlebrooks, Brian Dozier and Patrick Corbin have been called up from the minors, following top prospects Mike Trout and Bryce Harper. Who's next?
Matt LaPorta, 1B -- Cleveland Indians
LaPorta is still mashing in Triple-A and Casey Kotchman is still struggling in the big leagues. At some point the Indians will have to take another look at LaPorta, despite his prior struggles against big league pitching.
Kotchman is hitting .281 over the last 10 games but is still under .200 for the season and is slugging a disastrous .311. LaPorta is batting .333/.408/.658 through Monday.
Mark Melancon, RHP -- Boston Red Sox
Melancon was sent down after struggling with his command and the occasional flat breaking ball, but he's found both, it appears, in tossing 11 scoreless frames in Triple-A Pawtucket. Currently, Junichi Tazawa, Clay Mortensen and Andrew Miller are all throwing the ball very well, but perhaps Melancon could still earn late-inning opportunities.
Everth Cabrera, SS -- San Diego Padres
Orlando Hudson and Jason Bartlett continue to struggle and could be replaced any day. Cabrera is batting .336/.388/.414 with 15 stolen bases in Triple-A Tucson and is up around the .400 mark in his last 11 games.
Bartlett is batting just .133 and is 3-for-31 with 13 strikeouts in his past 10 games while Hudson is hitting .206 during the same span and .209 on the year. Cabrera is capable of handling either middle infield position.
Tanner Scheppers, RHP -- Texas Rangers
Not a soul is struggling on the pitching staff of the two-time defending American League Champions, with the exception of left-hander Matt Harrison. If the Rangers eventually replace Harrison in the rotation with right-hander Alexi Ogando, Scheppers could find his way to the big leagues this summer.
Harrison, however, has been effective for the better part of a season and a half and isn't going to lose his roster spot entirely, so Scheppers will have to force his way into a call-up. His recent streak of nine scoreless outings out of 10 is a good start, as is the one walk he's yielded in that span.
Stephen Pryor, RHP -- Seattle Mariners
Pryor, a 5th round pick in 2010, breezed through Double-A Jackson the second half of last season and did so again in 11 games to start this season. He fanned 24 in 16 frames, walking just two batters, and has been lights out in three games since moving up to Triple-A.
Pryor could easily find himself in the majors soon, and if the Mariners shop closer Brandon League this summer, Pryor could even get chances to log holds and saves late in games, thanks to a mid-to-upper 90s fastball and 86-88 mph slider.