|Venue: Flushing Meadows, New York Dates: 28 Aug-10 Sept|
|BBC coverage: Live radio and text commentary on selected matches every day.|
World number one Karolina Pliskova survived a scare to beat Nicole Gibbs in three sets and reach the US Open third round.
The Czech 25-year-old saved seven of nine break points to win 2-6 6-3 6-4 against the American in New York.
Pliskova had been on the back foot for much of the match but broke to love in the seventh game of the final set.
Last year’s finalist has to repeat the feat at Flushing Meadows to be in with a chance of retaining the top ranking.
After the match, Pliskova said she has not found it easy since becoming world number one.
“I think it’s easier for people to play me now than for me to play them – I feel the pressure now. Everyone is playing their best tennis against me and I felt it today.”
Ukrainian fourth seed Elina Svitolina beat Russia’s Evgeniya Rodina to safely progress to the US Open third round.
Svitolina won 6-4 6-4 in one hour and 22 minutes on Arthur Ashe Stadium.
Latvia’s French Open champion, 12th seed Jelena Ostapenko, also reached round three with a 6-4 6-4 win over Romanian Sorana Cirstea.
American world number 91 Jennifer Brady thrashed Czech Republic’s 23rd seed Barbora Strycova 6-1 6-1 in just 56 minutes in New York.
Japanese 19-year-old Naomi Osaka, who knocked out defending champion Angelique Kerber in round one, overcame Czech Denisa Allertova 6-3 4-6 7-5.
Qualifier Kaia Kanepi, a five-time Grand Slam quarter-finalist but ranked 418 after injury problems, beat Yanina Wickmayer 6-4 6-2.