Superstar duo Andy Murray and Serena Williams breezed into the second round of the mixed doubles at Wimbledon on Saturday, beating Germany's Andreas Mies and Chile's Alexa Guarachi 6-4, 6-1.

Murray and Williams – both former world number ones and singles champions at Wimbledon – had little trouble in dispensing with their opponents.

"Obviously I had lost in the doubles earlier (with Pierre-Hugues Herbert) so all my energy is focused on the mixed but it was a good start," said Murray.

Murray said physically he felt fine after two matches in one day, save for a stiff back.

The hip he had "life-changing surgery" on earlier this year had not given him any trouble.

"I feel good and am happy to be alive in this," said Serena.

There was an element of farce when they let slip a set point in the opener as Williams ended up tumbling over and landing unceremoniously on her backside at the net.

However, they closed out the set and took control of the next by breaking their opponents immediately.

Williams, a seven-time Wimbledon singles champion, said there was no boss in the team.

"I said to Serena before the match we are the younger siblings so we are used to being bossed by our older brother and sister," chipped in two-time Wimbledon winner Murray.

While mixed doubles is foreign territory largely for Murray, Williams is the youngest ever female winner, partnering Max Mirnyi to victory in 1998 aged just 16 at Wimbledon.

Wang Yafan from China and Anna Blinkova from Russia reached the 3rd round by beating Ajla Tomljanovic from Croatia and Maria Sakkari from Greece 6-1, 6-4. Han Xinyun from China and Oksana Kalashnikova from Georgia were defeated by Monica Niculescu and Irina-Camelia Begu from Romania 3-6, 6-3, 0-6.

Wang Yafan took her first win at Wimbledon by beating Tereza Martincova from Czech Republic in the 1st round. During her career, Wang, ranked 57th in world rankings, has reached the second rounds of all Grand Slams.

Wang was beaten by ninth-seeded Sloane Stephens from United States 0-6, 2-6 in the singles on Tuesday. And it was the first time Wang had the chance to face American star Stephens.

"Sloane Stephens' attack was strong and I played a little bit unsure of myself," Wang said.

In the 1st round, Han and Oksana Kalashnikova quarreled in the second set on grass court when they fell behind with 3-4. "It was the first time for us to be paired and I just didn't know the way she plays. We were lucky to reach the 2nd round," Han said.

Han told reporters that she planned to team up Wang Yafan, Zhu Lin from China or another foreign player. However, she failed to secure her desired partner for a variety of reasons. "At last, Oksana Kalashnikova came to me as a pair," Han said.

Thirteenth-seeded of ladies' doubles Duan Yingying and Zheng Saisai from China reached 3rd round at Wimbledon on Friday.

(Cover via VCG Photo)

(With input from agencies)