Stevenson advances to boxing final after Nikitin ruled out

Floyd Mayweather Jr., left, poses for picture with Shakur Stevenson after Stevenson won a men's bantamweight 56-kg quarterfinals boxing match against Mongolia's Tsendbaatar Erdenebat at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 16, 2016. (AP Photo/Dan…