Losing a tennis match can be painful. Losing one after holding a 5-0 lead in the deciding set can, however, be more devastating.

Madison Keys could barely believe what had just happened. After holding a commanding 5-0 lead in the deciding set against Qinwen Zheng, the American watched the match slip completely away, eventually throwing her racquet in frustration after suffering one of the most dramatic defeats of her US Open career.

The latest updates from Flushing Meadows on day seven, with Katy Murrells as your reporter

Coco Gauff reaches the US Open fourth round but last year's finalist Amanda Anisimova and Madison Keys go out on a mixed day for home hopes.

Madison Keys was the first player Tuesday to move into the second round of the US Open as rain threatened to hamper the schedule for a couple days.

The heat had taken its toll, sapping the strength of a crowd prepared for disappointment. Court 17 had fallen silent, briefly interrupted by half-hearted cheers, revealing how little belief was left in Madison Keys as she faced match point,

China's Zheng Qinwen came back from 5-0 down in the deciding set to beat American Madison Keys 1-6 7-6(3) ​7-5 in the U.S. Open third round on Saturday as she ‌battles back from a chronic right elbow injury that has stunted her career.

Madison Keys and Taylor Fritz were emotional and vulnerable in their postmatch US Open press conferences. Both jumped out to impressive leads but lost their matches.