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Next Gen ATP Finals: American youngster Learner Tien earned his third Top 10 win on Wednesday, beating countryman and top seed Ben Shelton 6-4, 7-6(2) to reach the quarterfinals of the Mallorca Championships.

The 19-year-old committed 16 fewer unforced errors than Shelton (22-38) and rallied from 1-4 in the second set to eventually triumph after one hour and 41 minutes in the pair’s first ATP head-to-head meeting.

"I thought I returned really well today," Tien said. "I felt it was tough to serve today with the wind. I felt my toss moved around a lot, but I thought I returned really, really well and gave myself a lot of looks on return games."