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Raducanu won four games in a row to serve for the match at 5-3 - then was broken again after huge errors with a backhand drive into the net and a double fault.

The only blip for the 13th seed came when he served for the match at 5-2, relinquishing his double break advantage with a double fault on break point.

She saved two break points, but Rybakina took advantage of a third to level it up and, after holding her serve, she broke Boulter thanks to a double fault on match point.

Another double fault in the fifth game gave Sabalenka a chance for a second break, which she grabbed with one of her 32 winners before serving out victory in one hour and 26 minutes.

The pair traded breaks in the second set but Gauff's game broke down, with the 20-year-old committing 25 unforced errors and six double faults.