Five busiest GMs this July

Theo Epstein and Jed Hoyer will be busy fielding inquiries for Ryan Dempster. Hannah Foslien/Getty Images

When Detroit Tigers president/general manager Dave Dombrowski acquired right-hander Doug Fister nearly a year ago, the trade came with mixed reviews.

When Dombrowski acquired outfielder Delmon Young a couple of weeks later, some thought Young’s history of unfulfilled potential would come to haunt the Tigers.

Dombrowski, however, simply saw two players who could help his team get to the postseason. Fister subsequently went 8-1 with a 1.70 ERA and minuscule 0.84 WHIP the rest of the 2011 season. Young also flourished, hitting .274 with eight homers. Without both of them, it’s unlikely the Tigers would reach the American League Championship Series.

Point is, a GM can't be afraid to make a decision this time of year that might be deemed unpopular. Whether you are a buyer or a seller, you need to be able to make bold deals that you think are best for your franchises, even if that might mean giving up a top prospect or trading a star as part of a rebuilding strategy.

With that in mind, here's a look at five GMs whose phone will be ringing off the hook this July and will have the most on the line.