Robles, the No. 12 seed, was defeated by unbeaten top seed Paul Donahoe of Edinboro by a score of 5-2. Robles' record is now 28-7, while Donahoe moves to 35-0.
After the match, the sophomore didn't let his handicap serve as an excuse for why he lost, saying, "He didn't beat me because I was born with one leg ... he beat me because he was just the better wrestler tonight. It's that simple."
Even though Robles likely has aspirations to win an NCAA Division I individual championship, just being in the semifinals is an incredible accomplishment. He still has a shot at a third-place medal Saturday against last year's champion, third-seeded Angel Escobedo.
"That would be a great accomplishment," Robles said. "I'd be happy with that."
Information from the Associated Press was used in this report.