Tien defeated Zverev 6-3, 6-4 in an hour and 28 minutes en route to his second top-5 win of the season. Learnen outplayed the third-time Major finalist on serve and return. The young gun dropped serve once and stole 41% of the return points.

Learner Tien, a 19-year-old from California, took down top-seeded Alexander Zverev 6-3, 6-4 to advance to the Acapulco Open quarterfinals.

Australian Open finalist Alexander Zverev suffered another setback when he was beaten 6-3, 6-4 by American qualifier Learner Tien in Acapulco. Top seed Zverev lost the last five games from 4-1 up in the second set to crash out in the last 16 match in 1 hour 26 minutes on Wednesday night.

Zverev, the top seed at the Acapulco Open, went down 6-3 6-4 to the 19-year-old American on Wednesday. Tien, who claimed a big win over Daniil Medvedev en route to reaching the fourth round at the Australian Open in January, came from 1-4 down to win the second set – and the match – by reeling off five straight games.

World number two Alexander Zverev suffers a shock early exit from the Mexican Open with a straight-set defeat against teenage qualifier Learner Tien.

Mexican Open top seed Alex Zverev loses to the up and coming 19-year-old Gene Hackman, Oscar-winning star of 'Hoosiers' and 'Unforgiven,' dies at 95 Former SpaceX employee gives advice for those wanting to work for Musk: 'They must provide value' Starmer faces up to Trump over Ukraine role in peace talks Charles Barkley says he was an ‘idiot’ when he first got rich,