New serving record for Lisicki
Sabine Lisicki recorded the fastest-ever serve in WTA Tour history during her first-round match at the Bank of the West Classic in Stanford on Tuesday.
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The German unleashed a delivery measuring 210.8 kph - 131 mph - in the opening set against Ana Ivanovic who somehow managed to get a racket on the ball.
Although the 24-year-old Lisicki, the Wimbledon runner-up in 2013, won the point she eventually lost the match, going down 7-6 (7/2) 6-1 in 84 minutes.
Her serve bettered the previous best of 207.6 kph -129mph - set by American Venus Williams at the US Open in 2007.
While Liscki fell by the wayside, Williams progressed to the second round with a 6-3 6-2 win over Poland's Paula Kania.
The seven-time Grand Slam singles champion smashed seven aces in the 73-minute match but was made to battle after taking a 4-0 lead in the second set, saving five break points in her last two service games.
She will next face world number 10 Victoria Azarenka at the hardcourt event. The fourth seed receieved a first-round bye.
Williams said: "She was a fighter. She has a diverse game, she can come to the net, she serves pretty well.
"She just kept staying in there, so I was happy to win the match."
Williams' sister Serena, who exited Wimbledon after struggling with a virus, will face Karolina Pliskova on Wednesday night.Canada's Carol Zhao will face Ivanovic next. Zhao progressed after Belgian opponent Yanina Wickmayer retired from their match due a viral illness. Zhao was leading 6-2 1-0 when Wickmayer was forced to concede defeat.
Defending champion Dominika Cibulkova crashed out of the tournament, losing to 6-2 4-6 6-2 to Spain's Garbine Muguruza.
A second upset of the day occurred when Spanish seventh seed Carla Suarez Navarro lost 6-3 7-5 to Puerto Rico's Monica Puig, but Daniela Hantuchova was a 6-3 6-4 winner against Paula Ormaechea.