MADRID (AP) - Serena Williams brushed aside Belinda Bencic of Switzerland 6-2, 6-1 to open her defense of the Madrid Open title on Sunday, while Maria Sharapova beat Klara Koukalova 6-1, 6-2 in the first round.
In the men’s tournament, Novak Djokovic withdrew before the start of the event because of a right wrist injury that had already affected his play at Monte Carlo last month.
“I did everything possible in order to play in Madrid,” Djokovic said. “But unfortunately my right arm injury has flared up again.”
The top-ranked Williams won nine of 10 games during one stretch to take control of her first match since taking a monthlong break following her early exit at Charleston.
Williams, who has won the clay-court tournament the past two years, broke Bencic five times and rounded out her lopsided win in less than an hour with her 11th ace.
Williams will play China’s Peng Shuai in the second round after she dismissed Kurumi Nara of Japan 6-2, 6-3.
Sharapova, who lost to Williams in last year’s final, converted six of eight break points to take advantage of Koukalova’s eight double-faults.
“Obviously the first match at a new tournament is always challenging,” Sharapova said. “It’s always an adjustment, especially after playing indoors last week, but I think it was a good start for me today and I’m happy I was able to win in two good sets.”
Sharapova, seeded eighth, will play Christina McHale of the United States next.
Also, fifth-seeded Petra Kvitova needed a third-set tiebreaker to get past Sorana Cirstea 6-1, 7-5, 7-6 (4). Kvitova will play Varvara Lepchenko after she held off Anabel Medina Garrigues 6-4, 4-6, 6-4.
Ana Ivanovic beat Madison Keys 6-1, 7-6 (4) to set up a meeting with fellow Serb Bojana Jovanovski. The 11th-seeded Ivanovic overcame her shaky serve by saving three of four break points.
Two seeded players were eliminated in the first round.
Czech Lucie Safarova came back to beat 12th-seeded Flavia Pennetta of Italy 1-6, 6-0, 6-3, and seventh-seeded Angelique Kerber of Germany retired when trailing to Caroline Garcia 6-3, 2-0.
“I’ve been feeling my back for a few days now and felt it again in the first set, and it was getting worse as the match went on,” Kerber said. “I’m disappointed I had to retire from the match. But I’d like to give all the credit to Caroline, who played an amazing match today.”
Other winners included 16th-seeded Sloane Stephens, Italians Francesca Schiavone and Roberta Vinci, Zheng Jie, Maria Kirilenko and Petra Cetkovska.
In the men’s first round, 16th-seeded Tommy Robredo lost 6-4, 6-4 to Roberto Bautista Agut.
Guillermo Garcia Lopez beat last year’s semifinalist Pablo Andujar 6-2, 2-6, 6-2, and France’s Jeremy Chardy rallied past Lukas Rosol 4-6, 6-3, 6-4.
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