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Tomas Machac upset Novak Djokovic as he captured the biggest win of his career to deny the Serbian a place in the Geneva Open final.

Machac reached his first ATP Tour final with a 6-4, 0-6, 6-1 victory after a hard-fought contest.

Djokovic had control of the first set, storming into a 4-1 lead, but Machac rallied to take the opening set.

After receiving a medical time-out before the second set, Djokovic superbly won the second set without dropping a single game but faded in the decider.

Djokovic won the opener in the third, but Machac came from behind to seal the win in two hours and seven minutes. He will face Casper Ruud or Flavio Cobolli in the final.