PARIS (AP) — Rafael Nadal was locked in a tight, compelling and lengthy French Open semifinal Friday when his opponent, third-seeded Alexander Zverev, ran to his right to chase a shot and twisted his right ankle. Zverev crumpled to the ground, wailing in agony and clutching at his lower leg.

His black outfit, arms and legs caked with rust-colored clay, Zverev was helped up by a trainer, then taken away from the court in a wheelchair. Minutes later, Zverev came back out onto Court Philippe Chatrier on crutches, his right shoe removed, and conceded the match, unable to continue.

The sudden end to a contest that was 3 hours old but not even through two full sets allowed Nadal to become, on his 36th birthday, the second-oldest men’s finalist in French Open history. Now he will try to become the oldest champion at a tournament he’s already won a record 13 times.

“Being in the final of Roland Garros is a dream, without a doubt,” Nadal said during an on-court interview, then revealed he had seen Zverev crying in a small room in the stadium.

“Very tough, no? And very sad for him, honestly, no?” Nadal told the full house of 15,000 spectators who had loudly tried to encourage him throughout the match, chanting “Ra-fa!” repeatedly.