Ben Shelton's toughest moment from the US Open didn't come from one of his opponents on the court ... but from his girlfriend during a postgame media session -- 'cause Trinity Rodman snuck in a savage question about his "slow" serves!!
Shelton met with the media after he advanced to the third round with a win over Spain's Pablo Carreño Busta in straight sets. Just as he was about to wrap up his day, Rodman -- who was present for the Q&A -- was able to ask one last question, much to her man's surprise.