Andreescu, a 19-year-old from suburban Toronto, downed 25th seed Mertens 3-6, 6-2, 6-3 to book a Thursday clash against fellow Slam semifinal debutante Bencic, the Swiss 13th seed who beat Croatian 23rd seed Donna Vekic 7-6 (7/5), 6-3.
Teen Andreescu rallies to meet Bencic in US Open semifinal
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