Britain's Cameron Norrie fought back from two sets down to earn a memorable win over Argentine ninth seed Diego Schwartzman on day one of the US Open.
Norrie, ranked 76th, looked set for a routine defeat before turning it around to win 3-6 4-6 6-2 6-1 7-5 in New York.
Both struggled to hold serve in a match with 58 break points, Norrie saving two match points in the decider before winning in almost four hours.
Later, Kyle Edmund plays Kazakhstan's Alexander Bublik (around 21:00 BST).
The four other Britons in the singles - Andy Murray, Dan Evans, Johanna Konta and Heather Watson - play on Tuesday.