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Baltimore Orioles, Chicago Cubs, Florida Marlins, Houston Astros, Kansas City Royals, Los Angeles Dodgers, Minnesota Twins, New York Mets, Oakland Athletics, San Diego Padres, Toronto Blue Jays, Washington Nationals: Not in contention, and expected to be sellers.
Arizona Diamondbacks: They are currently playing at a much higher level than anyone thought they would, but with a weak farm system, and a commitment to rebuilding, chances are they won't be buyers at the deadline.
Chicago White Sox: Many pegged the White Sox as the favorites in the AL Central this season, but they have been disappointing at five games under .500. Chances are they will be sellers, and they have some intriguing trade pieces in their starting pitching depth.
Cleveland Indians: While the Indians are legitimate contenders, they will be reluctant to move their top prospects, and may instead promote a few of them to help make a push this summer. Second baseman Jason Kipnis and third baseman Lonnie Chisenhall should be up at some point around the All-Star break, and they will serve as the team's mid season additions more likely than not.
Los Angeles Angels: The Angels are a team built on pitching, and they could use an upgrade offensively. However, their biggest holes are made at catcher, where rookie Hank Conger is still settling into his role, and in left field where Vernon Wells is making too much to bench. The team is also 36-38, and could wind up being sellers by July.
Milwaukee Brewers: The Brewers are in the thick of things in the NL Central, and they have glaring needs at shortstop and in center field. However, their farm system is decimated after trading for Zack Greinke and Shaun Marcum, and they don't have the horses to pull off a major deal.
Pittsburgh Pirates: The Pirates have the look of one of baseball's most promising up and coming teams, and it has certainly been a surprise that they are sitting at 36-37 on the season. It makes no sense for them to mortgage their future for a run at a .500 record, but they are on the right track.
St. Louis Cardinals: The Cardinals were in the market for a closer until the emergence of Fernando Salas in that role, and they are adamant about holding onto top prospect Shelby Miller. Retaining Albert Pujols at season's end is priority number one, so they will not be looking to take on a big contract of any sort.
Seattle Mariners: Much like the Pirates and Indians, the Mariners are on the right track with their current rebuilding, and while they have a wealth of young talent, they are best suited holding onto it and moving forward with the players they have.
Tampa Bay Rays: The Rays are technically in contention this season, but are clearly a tier below the Red Sox and Yankees after losing so many key players in free agency. Also, their biggest needs are at catcher and shortstop, and the market for those positions is slim to say the least.