Mertens eased past Jasmine Paolini 6-1, 7-5. Paolini, who had never faced a top-20 player before, gained confidence as the match wore on and Mertens had to save a set point.
It was more difficult for Van Uytvanck in the second singles rubber, but she prevailed against Sara Errani 6-4, 6-7 (6), 6-2.
Errani struggled with her serve, hitting 17 double faults to Van Uytvanck’s four, and at one point was given a time violation warning from the umpire after catching three service tosses in succession.
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