Marte is up against Giants first baseman Brandon Belt, Brewers outfielder Ryan Braun, D-backs third baseman Jake Lamb and Rockies shortstop Trevor Story.
Marte will get plenty of support from his teammates, including closer Mark Melancon, who was already selected to play in the Midsummer Classic.
"Starling Marte is the best athlete I've played with, hands down. He's extremely talented," Melancon said. "Sometimes I don't even know if he knows how talented he is. He's a ball of muscle that just goes out there and competes.
"I think he's got the best arm in the outfield I've ever seen.