Klitschko credits his relationship with his brother -- sometimes compared to that of the tennis world's champion sisters Serena and Venus Williams -- for his success.
Three time champion Arantxa Sanchez-Vicario dumped an error-prone Venus Williams out of the French Open to progress to the semi-finals.
Meanwhile, the elder sister of Serena Williams, seven-time grand slam winner Venus Williams , played a key role in a 2-1 win for the United States over South Africa in Perth.
ATHENS, Greece -- Defending Olympic champion Venus Williams and world number one Justine Henin-Hardenne were drawn to face each other in a potential quarterfinal at the Olympic tournament in Athens.
CHARLESTON, S.C. (AP) Serena Williams routed Venus Williams 6-1, 6-2 at the Family Circle Cup on Saturday, the most one-sided match in the sisters' long rivalry.
The seventh seed followed up her demolition of No. 11 Yanina Wickmayer by crushing Venus Williams 6-0 6-1 in Thursday's late match, inflicting the fourth seed's worst defeat of her distinguished career.
CNN: Ivanovic rises from the ashes in Rome as Venus crashes out
Three-time Miami champion Venus Williams continued her winning comeback from longterm illness, beating fellow former world No. 1 Ana Ivanovic 6-7 (4-7) 6-2 6-2.
Peer progressed to a match-up with Venus Williams as Li, who reached the semifinals of the Australian Open, retired with a back injury when trailing 5-7 0-3.
Fourth seed Sharapova, who could face a semi-final match-up with Venus Williams, lived up to a fearsome reputation with an exemplary display against an opponent 10 years older.
Maria Sharapova was even more convincing a few hours earlier, winning 6-0, 6-0 for the second time in two matches to set up a third-round encounter with Venus Williams.
In the women's tournament, Venus Williams advanced to the semi-finals with a 6-3 6-1 victory over Agnieszka Radwanska.
Four-time Olympic gold medalist, Venus Williams, spoke on behalf of Team USA and graciously thanked the WNBA for the honor.
Meanwhile, in the women's event, Australia's Samantha Stosur set up a clash with Venus Williams after defeating Swiss Patty Schnyder 7-6 6-2.
Venus Williams took advantage of Cornet's double-fault to end the first set.
Venus Williams lost her first two matches in three-set affairs, and was taken to a decider by Svetlana Kuznetsova for the first time in their eight career encounters before prevailing 6-2 6-7 (3-7) 6-4 in two and a half hours.
In the women's tournament, American third seed Venus Williams cruised into the fourth round with a 6-1 6-4 romp over Italy's Roberta Vinci.
CNN: Champion Murray battered by Fish in another Miami upset
In 1996, for example, New Regency started investing in Puma, the German athletic footwear company, with the idea of cross-promoting the talent of such stars as Venus and Serena Williams on the court and on the silver screen.
At the Hopman Cup in Perth, Venus Williams continued her fine form as the United States beat France 2-1 for their second victory in the mixed team event.
CNN: Injured Sharapova pulls out of season opening tournament
The world's top eight players have been divided into two groups for this tournament, with the top two from each progressing to the semi-finals, although world number three Serena Williams and number five Venus Williams are absent this year through injury.
Sixth seed Angelique Kerber of Germany ended Venus Williams dreams of a third U.S. Open title with a 6-2 5-7 7-5 win over the American.
Sharapova's compatriot Svetlana Kuznetsova produced the day's biggest shock by registering a comfortable 6-1 6-2 third-round win against Radwanska, who eliminated former world No. 1 Venus Williams on Wednesday.
Dubai organizers expect the rest of the world's top-10 players to play, including Australian Open winner Serena Williams and her sister Venus, the defending champion.
Top seed Venus Williams faces Slovakia's Janette Husarova on Wednesday, who reached the second round with a 6-3 6-1 triumph Tuesday over Italy's Adriana Serra Zanetti.
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