The foot of Rafael Nadal receives medical attention. (Clive Brunskill / GETTY IMAGES)

Updated at 4:08 p.m. EDT

Rafael Nadal pulled out a four-set victory over Juan Martin Del Potro as the light at the All England club was fading, 7-6 (8-6), 3-6, 7-6 (7-4), 6-4.

Of greater concern for Nadal was the foot injury he suffered, one that, he said, made him consider retiring from the match.

“I don’t know what the problem is yet. Seems like it’s in the bone, but in the foot. I don’t know to explain it in English,” Nadal said. “For a moment at the end of the first set, I thought I’d have to retire. ... I was able to continue but in a little bit of pain.

Nadal, who plays Mardy Fish next, said “I felt something really strange” and would have his foot examined tomorrow.

Updated at 3:25 p.m. EDT

Juan Martin Del Potro hurt his hip and had to leave the court for treatment, an injury that looked far more serious and painful than Rafal Nadal’s earlier injury.

Nadal leads two sets to one, winning both on tiebreakers. He won the first 8-6 and the second 7-4; Del Potro won the second set 6-3. The winner gets American Mardy Fish next.

Filed at 1:40 p.m. EDT

With celebrities like Prince William and Catherine, the duchess of Cambridge, and Jay Z watching, Rafal Nadal hurt his left foot, just as the first set of his Wimbledon match against Juan Martin Del Potro on Centre Court was about to enter a tiebreaker.

It took about eight minutes for Nadal, who appeared to have suffered an injury to the bone on the outside of his foot, to be treated, an expenditure of time that seemed to irritate Del Potro. Nadal’s foot was wrapped and he and Del Potro returned to the court.

Nadal won the tiebreaker, 8-6, but left the court for more treatment — infuriating Del Potro, who slammed his racket against his chair and expressed his anger.