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Stefan Kozlov overcame leg cramps and upset Grigor Dimitrov 7-6 (8), 5-7, 6-2 to move into a second-round match against Rafael Nadal at the Mexican Open.
The No. 130-ranked Kozlov got a spot in main draw as lucky loser after Maxime Cressy withdrew because of injury.
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Kozlov struggled with cramps in his right leg at the end of the second set, but continued to play and Dimitrov failed to take advantage in the match that lasted a tournament record 3 hours and 21 minutes.
Nadal, who won the Australian Open last month, is one of four Top 5 players in the draw at Acapulco alongside Australian Open runner-up Daniil Medvedev, defending champion Alexander Zverev and fourth-seeded Stefanos Tsitsipas.
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