Dart and Parry upset Olympic champions at US Open

Harriet Dart (left) and Diane Parry (right) have finished runners-up in the women's doubles at the Nottingham Open twice in the last two seasons

Britain's Harriet Dart and her French partner Diane Parry stunned Olympic champions Sara Errani and Jasmine Paolini on a day of mixed fortunes for British doubles players at the US Open.

Unseeded pair Dart and Parry beat the Italian sixth seeds 7-6 (7-3) 3-6 6-3 on Friday to reach the third round of the women's doubles.

Katie Boulter and Maia Lumsden could not pull off similar upsets against higher seeded opposition respectively in their second-round matches.

Eighth seeds Demi Schuurs and Luisa Stefani overcame Boulter and Anna Kalinskaya 7-6 (10-8) 7-6 (7-5) to reach the third round, while ninth seeds Sofia Kenin and Bethanie Mattek-Sands defeated Lumsden and Anna Siskova of the Czech Republic 6-2 6-1.

In the men's doubles, Wimbledon champions Henry Patten and Harri Heliovaara secured their place in the third round with a 6-0 7-5 victory over Italian Flavio Cobolli and Switzerland's Dominic Stricker.

Neal Skupski and New Zealand's Michael Venus also won their second-round match, with the eighth seeds beating Argentine Guido Andreozzi and Indian N. Sriram Balaji 7-6 (7-4) 6-4.

Mixed doubles top seeds Joe Salisbury and Canadian Gabriela Dabrowski were handed a tough draw in the first round against defending champions Anna Danilina and Heliovaara.

The unseeded Kazakh-Finnish team pulled off a comeback to win 4-6 7-6 (7-5) 10-8.