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ACAPULCO, Mexico — American teenager Learner Tien beat top-seeded Alexander Zverev 6-3, 6-4 to move into the quarterfinals of the Mexican Open in Acapulco. It was his second career win over a top-five player. The 19-year-old defeated Daniil Medvedev (5) in the second round of the Australian Open in January when he reached the fourth round. The left-handed Tien is the youngest player to win his first two matches against top-five opponents. Tien is next playing eighth-seeded Tomas Machac, who advanced after beating Daniel Altmaier 7-6 (3), 6-1.
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