Bodog Beat

It looks like the Williams sisters are once again on a collision course at Wimbledon. (Wikimedia Images)

Top seed Dinara Safina needed all her battling qualities to beat former champion Amelie Mauresmo 4-6, 6-3, 6-4 under the closed Centre Court roof in the fourth round at Wimbledon on Monday.

Next Safina (-250) will play unseeded German Sabine Lisicki (+180) for a place in the semi-finals.

Third seed Venus Williams booked her place in the quarter-finals at Wimbledon on Monday after Serbian 13th seed Ana Ivanovic retired injured in their fourth-round clash.

Venus is a heavy -1000 favorite to beat Agnieszka Radwanska in her next match and move on to the semi-finals.

Likewise, Serena Williams reached the Wimbledon quarterfinals after defeating Daniela Hantuchova 6-3, 6-1. Serena will play Victoria Azarenka next and is pegged as a -350 fave to win that match.

Elena Dementieva and Francesca Schiavone will square off in the other match of the day.

UPDATE: Venus has knocked off Radwanska in straight sets to secure a spot in the semis.

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