Gold medalist Matthew Centrowitz (hamstring) out of Olympic trials

(Photo credit: James Lang-USA TODAY Sports)
Matthew Centrowitz, who won the gold medal at the 2016 Olympics, pulled out of the 1,500-meter competition at the U.S. Olympic trials on Friday due to a hamstring injury, just hours before racing was set to begin in Eugene, Ore.

Centrowitz ended a 108-year drought for U.S. men's Olympians in the 1,500 meters when he won the event in a stunning upset in Rio de Janeiro. He was ho