Zheng Qinwen Lội Lội Chiến Thắng Madison Keys Tại US Open Với Trận Đảo Ngược Kinh Điển

core: Zheng Qinwen defeated Madison Keys at the US Open in a dramatic comeback, demonstrating resilience despite elbow surgery and a low ranking of 121.
key_facts: - Zheng won from 1-6 and 0-5 down with a match point against her; - Keys failed to convert multiple match points, showing psychological instability; - Zheng's true competitive level is elite (Top 5), far above her current No. 121 ranking; - Anisimova lost to Potapova with a poor 19% break-point conversion rate; - Potapova showed strong clutch performance with 75% conversion; - Zheng's path via qualifying to upset seeded players is historically significant
source: Stage-2 Deep Analysis of Zheng Qinwen vs Madison Keys US Open match and related WTA matches
related: question: What was the key factor in Zheng's comeback?, answer: Zheng's mental resilience and patient strategy overwhelmed Keys' emotional collapse.; question: How did Zheng's ranking affect her performance?, answer: Her ranking of 121 was temporary, reflecting post-surgery recovery but not her true elite ability.; question: What does Potapova's win over Anisimova indicate?, answer: Potapova's 75% break-point conversion shows improved clutch performance and breakthrough potential.