Jannik Sinner accused of 'breaking' rival's racket in crucial moment at Shanghai Masters

's opponent jokingly accused him of "breaking" his racket by playing "too fast" during their Shanghai Masters semi-final.

Tomas Machac was up against it as he served to stay in the match while trailing the world No. 1 4-6 4-5.

He was forced to stop the game so he could change rackets before serving again after the frame appeared to disintegrate.

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