Every contender would love to add an ace to its rotation, but you can't win if you can't score. And with offense lacking across the majors again this season, big bats -- and perhaps a fast pair of legs -- are in high demand. And these players are on many teams' wish lists.
Justin Upton, OF, Padres
A pending free agent, Upton is one of several high-profile Padres who could be dealt in what has been a disappointing season for the franchise. Upton would supply the pop that many teams covet, and his power numbers likely would improve outside of cavernous Petco Park.
Getty ImagesDenis Poroy
Yasiel Puig, OF, Dodgers
It remains to be seen whether Puig actually will be dangled as trade bait -- or, more specifically, whether another team could entice Los Angeles with a sweet enough offer -- as the Dodgers strive to improve their rotation and bullpen (and, perhaps, their clubhouse chemistry). Injuries have derailed the slugger this season, who was an All-Star in his second season in 2014.
Getty ImagesStephen Dunn
Ben Zobrist, IF/OF, A’s
A popular target because of his combination of power and speed, Zobrist might be most valuable for his defensive versatility – he has played every position but catcher during his major-league career. Plus, he has three seasons of playoff experience. UPDATE: The Royals landed Zobrist in a trade Tuesday.
Getty ImagesRich Schultz
Jay Bruce, OF, Reds
With the Reds clearly in sell mode, Bruce is among the players who will draw plenty of attention. His power has been down the past couple of years, but Bruce topped 30 homers in each season from 2011-13. And he isn't just a rental -- he is signed for two more seasons (team option for 2017) at a reasonable price.
Getty ImagesKirk Irwin
Carlos Gomez, OF, Brewers
After averaging 37 stolen bases the previous three seasons, Gomez has been slowed by leg injuries (hamstring, hip, groin) this season and dropped from the leadoff spot. However, he still offers power and Gold Glove defense in center.
Getty ImagesKevork Djansezian
Yoenis Cespedes, OF, Tigers
A free agent after the season, Cespedes could be dealt for the second time since December. In addition to his tremendous raw power, Cespedes hits for average and has a cannon for an arm.
Getty ImagesRob Leiter
Marlon Byrd, OF, Reds
Well on his way to his third consecutive 20-plus-homer season, Byrd would be a less costly pickup for a team in the market for power. And he thrived as a late-season rental with the Pirates in 2013. However, Byrd's low walk totals and on-base percentage are issues.
Getty ImagesJoe Robbins
Carlos Gonzalez, OF, Rockies
Gonzalez has managed to stay healthy this season and has been red-hot leading up to the deadline. But his slugging percentage is down from recent seasons, and that power outage likely would worsen away from Coors Field. Like Jay Bruce, CarGo is under contract for two more years.
Getty ImagesJustin Edmonds
Gerardo Parra, OF, Brewers
Another under-the-radar option who won’t deplete the farm system in a trade, Parra is having his finest offensive season and provides a .300-plus average from the leadoff spot. He also brings Gold Glove defense.
Getty ImagesJoe Robbins
Ben Revere, OF, Phillies
The focus in Philly has been on the arms who are available, but Revere is a solid center fielder whose batting average has hovered around .300 this season. He also has topped the 20-steal plateau for the fifth consecutive season.