Oregon (Reuters) - Olympic bronze medalist Walter Dix edged out Tyson Gay in the former world champion's hotly-anticipated return to the 200 meters at the Prefontaine Classic Diamond League meeting on Saturday. In the 110 meters hurdles, American David Oliver recorded the fourth fastest 110 meters hurdles of all time with a 12.90 second run. Gay, who has been battling a nagging hamstring problem for seven weeks, ran his first 200 of the year in 19.76 seconds to finish just shy of Dix, who took control coming off the bend and stayed in front to win in 19.72. "It wasn't...