American League HR and RBI races may have been significantly altered with the news that we may have seen the last of Jose Bautista and David Ortiz for the season. Meanwhile, a trade between the Orioles and Diamondbacks has locked in a regular rotation turn for phenom Tyler Skaggs...

The Pirates have lost Starling Marte to the DL with a strained oblique, and Michael Cuddyer returned to the DL as well. Heading the other way, off the DL, are Garcia, Lawrie, Bonifacio, Polanco and Anderson.

The Reds are making due without their starting 1B and 3B and will have to do without Joey Votto for a bit longer. Meanwhile, a couple of unlikely candidates are being eyed for the Royals 2013 rotation.

Cubs add two heralded young players to roster; in KC, an elite speedster works his way into the good side of a platoon; the A's have issues in both their rotation and bullpen; and Evan Longoria may be about to make his long-awaited return.

Francisco Liriano is movin' on up to the top team in the AL Central. Chris Johnson is also on the move. Meanwhile, Alexi Ogando's uniform is staying the same, though his role may be a-changin'. And we may have seen the last of Logan Morrison this season.

The Phillies are set to welcome Roy Halladay back from the disabled list Tuesday, but a number of other players, including Coco Crisp, Ian Desmond, Chad Billingsley and Jed Lowrie, are headed in the other direction: to the DL, or at least to the doctor for further examination.

The Red Sox and Rangers rotations will get a boost with the post-All-Star-Break returns of Clay Buchholz and Colby Lewis, respectively.

In Arizona and Seattle, the reason is injury. In Baltimore, simple ineffectiveness. The net effect is the same: A door is opening for a new pitcher to join a starting rotation. Who will attempt to fill the voids, and what are their chances of success?

Two of the National League's top prospects, Anthony Rizzo and Trevor Bauer, may be on their way.

The A's have decided to go to a closer-by-committee, opening the door for young Ryan Cook to seize a more prominent bullpen role. Meanwhile, the Marlins have promoted Gaby Sanchez, installing at 1b, which will cost the team's OFers some playing time.

Matt LaPorta... Brett Wallace... Fernando Martinez... At one point, all occupied lofty positions on many a prospect ranking list. Now, all three are back in the majors. What are their chances of success, and how long might they stay?