Tallon Griekspoor stuns top seed Alexander Zverev at Indian Wells - ESPN

INDIAN WELLS, Calif. — Tallon Griekspoor upset No. 1 seed Alexander Zverev 4-6, 7-6 (5), 7-6 (4) in a marathon second-round clash Friday at Indian Wells.

Griekspoor collapsed on the court after converting his sixth match point to end an absorbing 3-hour, 7-minute affair under sunny skies on Stadium One court.

It was Griekspoor's first win over a top-five opponent in 19 attempts.

«Finally,» Griekspoor wrote with a smiley face on the TV camera lens after the hard-fought victory.

Zverev served for the match in the second set but didn't get it over the line, and Griekspoor won the second-set tiebreaker to force a decider.

Griekspoor failed to convert five match points while serving up 6-5 in the third, but regrouped to win the deciding tiebreak.

«I'm incredibly proud. It was such a mental battle to beat him,» Griekspoor said. «I beat him once but then lost the next six times, so it was such a mental thing. Happy to finally get it out of the way.»

Griekspoor will face big-serving Frenchman Giovanni Mpetshi Perricard in the third round.

Zverev has struggled with his form since losing to world No. 1 Jannik Sinner in the Australian Open final in January.

«I'm just not playing good tennis at the moment. It's as simple as that,» he told reporters. «I'm not playing a level that I want to play, definitely not playing anywhere near what I played in Australia.

»I'm just disappointed with my game."

The world No. 2 said he needs to regroup.

«Right now, it's not clicking,» Zverev said. «I have to find a way to make that happen.»

In other men's results Friday, Tommy Paul, the No. 10 seed, eased past fellow American Tristan Boyer 6-3, 6-1 in front of packed stands on court three.

Paul, who reached the semifinals of the BNP Paribas Open