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·Masters·ClayAdolfo Daniel Vallejo defeated Learner Tien 6-4, 6-3 — Madrid Open 2026 R64.
Learner Tien and Adolfo Daniel Vallejo: Adolfo Daniel Vallejo leads 1–0 across 1 recorded meeting.
Adolfo Daniel Vallejo, ranked No. 96, knocked out the No. 21 seed Learner Tien in straight sets, and the first-serve column tells the story: 68% of first-serve points won to Tien's 57%. The qualifier-level outsider also struck three aces to none and trimmed his errors to 20 against Tien's 32. In their first meeting and first clash on clay, Vallejo took 12 of 19 games to flip the ranking gap.