Spain's Rafael Nadal said moving into a 14th French Open final because opponent Alexander Zverev was injured and taken off court in a wheelchair was "not the way" he wanted to win.
Nadal, seeded fifth, was leading 7-6 (10-8) 6-6 when Germany's Zverev retired after turning on his ankle.
"If you are human, you should feel very sorry for a colleague," Nadal said.
"To see a colleague like this, even if for me it's a dream to be in the final, is not the way that we want it to be."
Zverev said it "looked like a very serious injury" in a video message posted on Instagram on Friday night.
"The medical team and doctors are still checking on it. We will let you know as soon as we know more," he said.
"It is not an easy moment for me."
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