US Open: Novak Djokovic, Serena Williams in cruise mode

New York: Novak Djokovic reached the third round of a Grand Slam for the 25th consecutive time while Serena Williams racked up her 80th US Open win as the top seeds eased into the third round on Thursday. They were joined in the last 32 by 2012 winner Andy Murray and reigning Wimbledon women’s champion Petra Kvitova.

But former world number one Ana Ivanovic, the eighth seed, and 2011 champion Samantha Stosur were knocked out on a day when stiff winds brought new challenges at Flushing Meadows for players already tackling plus-30 degree heat (+90F). World number one and top seed Djokovic breezed past France’s Paul-Henri Mathieu 6-1, 6-3, 6-0, firing 13 aces and 33 winners as the 2011 champion comfortably remained on course for a fifth successive final appearance.

“It’s very windy, but I managed to adjust to the conditions that obviously are not easy for myself and my opponent,” said Djokovic, who next meets Sam Querrey of the United States, after his brief 90-minute appearance.

World no. 1 Williams, chasing a third successive New York title, her sixth in total and an 18th major, sent 25 winners past Vania King and broke serve six times, wrapping up a 6-1, 6-0 victory on windswept Arthur Ashe Stadium in just 56 minutes.

It was her second win over an American at the tournament this week after beating teenager Taylor Townsend and next she will face another in Varvara Lepchenko for a place in the last 16.

Eighth-seeded Murray brushed aside 27-year-old German qualifier Matthias Bachinger, the world number 235, with a convincing 6-3, 6-3, 6-4 win. Murray exhibited none of the physical problems he suffered in the first round when he was cramping, sending down 36 winners past Bachinger, a contemporary from his junior days. Canadian fifth seed Milos Raonic made the third round with a 7-6 (7/4), 5-7, 6-4, 7-6 (7/3) win over German qualifier Peter Gojowczyk.

Ivanovic, Stosur beaten Eighth-seeded Ana Ivanovic suffered her earliest exit in five years when the former world number one lost 7-5, 6-4 to Karolina Pliskova of the Czech Republic. The Serb followed fourth-seeded Agnieszka Radwanska out of the tournament after the Pole had been beaten by Peng Shuai 24 hours earlier.

The former French Open champion was undone by 29 unforced errors. Stosur, the 24th seed, squandered two match points in a 3-6, 6-3, 7-6 (10/8) defeat to Estonia’s Kaia Kanepi, a six-time Grand Slam quarter-finalist.

There were no such dramas for Kvitova who defeated fellow Czech Petra Cetkovska 6-4, 6-2 while Canadian seventh seed Eugenie Bouchard, the runner-up at Wimbledon, beat Sorana Cirstea of Romania 6-2, 6-7 (4/7), 6-4.

Fifteen-year-old American CiCi Bellis, who became the youngest winner of a US Open match since 1996 when she won her first round match, went down 6-3, 0-6, 6-2 to Zarina Dyas of Kazakhstan.