Tien matches his Masters 1000 best as his level keeps climbing in Montreal

American Learner Tien, the No. 12 seed, beat Argentina’s Thiago Agustin Tirante 6-4, 6-4 in the round of 16 of the National Bank Open on Sunday to reach his first Montreal quarter-final, though the scoreline undersold how hard he had to work for it. Tirante saved four match points along the way before Tien, ranked No. 19, finally closed out the win. The win was the 20-year-old’s second…

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