Aroldis Chapman - Look for Chapman, who was clocked in at 103 MPH, to be an immediate impact for the Reds and live up to his hype
Jeremy Hellickson - Called up by the Rays with two pitchers placed on the DL, Hellickson has been masterful going 3-0 with a 2.05 ERA
Carlos Santana - Santana added a big extra bat to the Indians, showing off his power early
Ike Davis - Davis was a major call-up for the Mets that has helped them tremendously, and is now a fan favorite
Travis Wood - Wood was a call-up by the Reds due to injury, and is only his second major league start, he flirted with a no-no
Barry Enright - Barry Enright has become an amazing addition to the Arizona Diamondbacks, going 5-2 with a 2.44 ERA
Chris Johnson - Chris Johnson was an addition to the Astros to fill in at third base. Since his call up he is batting .329 with 36 RBI
Stats courtesy of Yahoo!