A classic French Open match ended in agony.br br Alex Zverev crumpled to the ground, screaming in pain after his ankle rolled over horribly while reaching for a forehand in his semifinal match against Rafael Nadal.br br Zverev rolled around on the clay, clearly in a massive amount of pain, before a wheelchair was brought out.br br Nadal won the first set in an epic tiebreaker, and the Spaniard winning that point had sent the second set to a tiebreak.br br Zverev returned to the court on crutches to officially retire from the match.br br Nadal, a 13-time champion at Roland Garros, will face the winner of the Casper Ruud-Marin Cilic semifinal.