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.

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

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