Injured Nadal stops, putting del Potro back in US Open final
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NEW YORK (AP) — Defending champion Rafael Nadal retired from his U.S. Open semifinal because of a painful right knee after dropping the opening two sets, putting Juan Martin del Potro back in a Grand Slam final for the first time since he won the 2009 title at Flushing Meadows.
Del Potro was leading 7-6 (3), 6-2 after two hours of play Friday when Nadal shook his head and said he had to stop.
"That was not a tennis match at the end. Just one player playing, the other staying on one side of the court," Nadal said. "I hate to retire, but staying one more set out there, playing like this, would be too much for me."
The No.