Serena Williams took another step towards her first calendar Grand Slam with victory over Kiki Bertens in the second round of the US Open.
According to a bbc report, the world number one trailed 4-0 in the opening tie-break but came back to win 7-6 (7-5) 6-3 at Arthur Ashe Stadium.
Williams, 33, is now five wins from her 22nd major title and the first calendar Slam in 27 years.
Rafael Nadal was also tested in his match but beat Diego Sebastian Schwartzman 7-6 (7-5) 6-3 7-5.
The Spaniard, who trailed 5-3 in the first-set tie-break and fell a break behind in both the second and third sets, admitted he had to fight for the victory.
Elsewhere, defending champion Marin Cilic returned to the Arthur Ashe stadium for the first time since winning the title last year with a 6-2 6-3 7-5 win over Evgeny Donskoy.
Grigor Dimitrov made another early Grand Slam exit as the 17th seed, a Wimbledon semi-finalist in 2014, was beaten 6-3 7-6 (7-2) 2-6 4-6 6-4 by Mikhail Kukushkin, the world number 56.
Tenth seed Milos Raonic overcame a back problem to beat Fernando Verdasco 6-2 6-4 6-7 (5-7) 7-6 (7-1), women’s 25th seed Eugenie Bouchard beat Polona Hercog 6-3 6-7 (2-7) 6-3, while Venus Williams saw off Irina Falconi 6-3 6-7 (2-7) 6-2.