British number one Johanna Konta has been knocked out of the US Open in the fourth round by Anastasija Sevastova.
The 13th seed lost 6-4 7-5 against the Latvian world number 48.
Konta fought back to 5-5 from 4-1 down in the second set and saved two match points, but was finally undone as Sevastova broke serve to win.
Sevastova, who retired in 2013 before making a comeback, will play eighth seed Madison Keys or Caroline Wozniacki in the quarter-finals.
Playing in the first match of the day on Flushing Meadows' showpiece Arthur Ashe court, Konta struggled to impose herself in tricky conditions with half the court in bright sunlight and the rest shaded by the arena's new roof.