The result won't always conform with a sense of how close the matches were: A winner of a five-setter in which he dropped two sets in tiebreakers and won the other three sets 6-0 probably would have a higher dominance ratio than a straight-sets win in which each set was decided by a tiebreaker.
Venus, the fourth seed at the clay court tournament, was broken early and lost the opener to the 15th-seeded Italian, but recovered to win the next two sets easily for a 3-6 6-1 6-2 win.
Argentina's Monaco registered a straight-sets win over Lukas Rosol of the Czech Republic.
Four-time grand slam champion Clijsters felt there was still room for improvement in her game despite recording a third successive straight-sets win.
Many have tipped Croatian 10th seed Marin Cilic as a dark horse for the title and he enjoyed a straight-sets win against Spain's Daniel Gimeno-Traver.
Murray will meet Tomas Berdych in the fourth round on Sunday after the Czech Republic 15th seed enjoyed a straight-sets win over American John Isner, ranked 17.
Roddick, who been troubled by a shoulder injury this season, looked on his way to a straight-sets win but Mahut fought back to level the match in a tie-break.
Sixth seed Juan Martin del Potro eased past German Benjamin Becker 6-2 6-4 6-2, while French seventh seed Jo-Wilfried Tsonga battled to a straight-sets win over Japan's Go Soeda.
Sixth seed Venus Williams, who is chasing her first Australian Open title at the age of 29, claimed her second consecutive straight-sets win as she was similarly untroubled by Sybille Bammer 6-2 7-5.
It capped a big week for Kvitova, who beat former world No. 1 and 2011 Dubai champion Caroline Wozniacki in the semifinals after ending the title defense of fourth-ranked Agnieszka Radwanska following a straight-sets win over Ana Ivanovic.
Three runners-up will win custom club fitting and sets of Callaway clubs, while 10 third-prize recipients will receive a Callaway driver.
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The win sets up an All-Ireland semi-final meeting with Connacht champions Corofin in February and on this evidence, it will take a very good team to beat St Gall's in the spring.
Nadal will play Stanislas Wawrinka in the quarterfinals after the Swiss beat Frenchman Richard Gasquet in a thrilling match, with the ninth seed rallying from two sets down to win 6-7 4-6 6-4 7-5 8-6.
'The Viking' held his nerve in a thrilling match, coming back from 3-0 and 4-2 down in sets to win.
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Fourth seed Venus followed up her opening win over Patty Schnyder with another routine straight-sets victory, defeating Israeli 16th seed Shahar Peer 6-3 6-4.
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American Sam Querrey booked his place in the last four following a straight sets 6-3 7-5 win over Xavier Malisse.
In the men's ATP event, which is headed by Britain's Andy Murray, Japanese fifth seed Kei Nishikori began his campaign with a straights sets 7-5 6-2 win over Australian Marinko Matosevic.
Andreas Seppi gave Italy an early lead as he came from two sets down against Vasek Pospisil to win 5-7 4-6 6-4 6-3 6-3 in three hours and 15 minutes, but Canadian No. 1 Milos Raonic beat Fabio Fognini 6-4 7-6 (7-4) 7-5.
The seventh seed was never ahead in sets until he wrapped it up to win 4-3, and really should have been sent packing by the Lancastrian, who missed many crucial doubles.
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The No. 31 seed recorded a straight-sets 6-2 6-2 6-4 win over Spain's Feliciano Lopez.
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The fans sensed the first goal could win the match - and promotion - and Wembley echoed to magnificent support from both sets of supporters.
The win is France's first over Spain since 1923 and sets up a semi-final against either Argentina or Russia.
World No.2 Nadal is struggling with the knee injury he picked up Wednesday's quarterfinal win over Jo-Wilfred Tonga, where he was taken to three hard-fought sets.
The opening day of the second grand slam of the season did not feature the leading attractions, but French hope and fifth seed Jo-Wilfried Tsonga gave the home crowd some cheer with a four sets win over Russian qualifier Andrey Kuznetsov.
But the Scot responded well, winning the third set 6-2 in just 33 minutes before surviving another tie break to win through in four sets in three hours and 27 minutes.
Radek Stepanek celebrated his first call-up to the Czech Republic's Davis Cup team with a straight sets win over compatriot Jiri Novak at the Milan Indoors event.
The 21-year-old Argentine came into the tournament with a wrist problem, and dropped sets in each of his opening three matches - including a gruelling five-set win over James Blake.
Home hopes were boosted by an easy straight sets win for seventh seed Andy Roddick over Thiemo de Bakker of the Netherlands while in-form Jo-Wilfried Tsonga of France was taken to three sets before beating Albert Montanes of Spain, 4-6 6-3 6-3.
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