Defending champion Ana Ivanovic came through a tough first set to beat Akgul Amanmuradova of Uzbekistan 7-6, 6-2 and reach the third round of the German Open on Wednesday.
Former French Open champions Gustavo Kuerten and Carlos Moya slumped to first-round defeats at the Monte Carlo Masters.
Stanislas Wawrinka was still struggling to digest the fact that he had won a second grand slam title, and did it by overcoming a player who had until Sunday, been unbeatable on clay in 2015.
Top seed Ana Ivanovic beat Russian Svetlana Kuznetsova 6-4, 6-3 in the Pacific Life Open final on Sunday.
Novak Djokovic held off a fightback by American Mardy Fish to win the Pacific Life Open final 6-2, 5-7, 6-3.
Former winner Maria Sharapova, her Russian compatriot Anna Chakvetadze and Serb Ana Ivanovic joined world number one Justine Henin in the semi-finals of the WTA Championships on Thursday.
Serbians Jelena Jankovic and Ana Ivanovic registered easy victories to advance to the fourth round of the Pacific Life Open. Third-seeded Jankovic shrugged off gusting winds to sweep aside Ai Sugiyama of Japan 6-1, 6-1, while top seed Ana Ivanovic, the world number two, also progressed with great ease, dispatching Italy's Tathiana Garbin 6-3, 6-0.
Top seed Jelena Jankovic and Venus Williams expressed disappointment with Sania Mirza's withdrawal from the Tier II Bangalore Open.
Unseeded Argentine David Nalbandian inflicted a shock 6-1, 6-2 defeat on world number two Rafael Nadal in the Madrid Masters on Friday to earn a semi-final showdown with young Serb Novak Djokovic.
The Russian swept aside Danish teenager Caroline Wozniacki to set up a clash with Polish teenager Agnieszka Radwanska.
Mikhail Youzhny made a shock first-round exit at the World Indoor Tournament, losing to unseeded Serb Janko Tipsarevic.
The 'Big Four' has become a 'Big Three' with the shock exit of Rafael Nadal, and the remaining trio of Roger Federer, Andy Murray and Novak Djokovic will all be aiming to prove their elite credentials in Wednesday's quarter-finals.
The 20-year-old Serb said he would take time out to celebrate his success with people who matter.
Novak Djokovic scored a 4-6, 6-4, 6-3, 7-6 victory over Frenchman Jo-Wilfried Tsonga in the Australian Open final.
A battered and bruised Jelena Jankovic is taking time off tennis to heal after injury scuppered her Australian Open hopes in the semi-finals on Thursday.
Fifth seed Maria Sharapova crushed Jelena Jankovic, while Ana Ivanovic recovered from a terrible start to beat Daniela Hantuchova in the Australian Open semi-finals.
For Bosnia and Chechnya, the 'Army of Allah' has spread around the Muslim world.
Venus Williams went the way of sister Serena, battered by a Serb baseliner, losing to fourth seed Ana Ivanovic in the quarter-finals of the Australian Open.
The third seed registered an emphatic 6-0, 6-2, 7-6 win over German Benjamin Becker in the first round of the Australian Open
World number one Justine Henin set up a dream final against second-ranked Svetlana Kuznetsova after beating Ana Ivanovic at the Sydney International on Thursday.
A gruelling off-season training regime in Australia paid off for Ana Ivanovic when she fought back from the brink of defeat to beat France's Virginie Razzano 6-1 2-6 7-5 at the Sydney International on Tuesday.
The triumph will put the 19-year-old Serb, who reached this year's French Open final and Wimbledon semi-finals, fourth in the rankings.
Both players burn with heaps of motivation to hoist the winner's trophy at Arthur Ashe Stadium in the last grand moment of the 2015 slam season.
When it comes to the Australian Open the Serbian reigns supreme.
World No 1 Novak Djokovic beat Roger Federer 6-4, 5-7, 6-4, 6-4 to win the US Open title at the Flushing Meadows in New York on Sunday.
A summary of sports events and sports persons, who made news on Friday
Rafael Nadal blasted past Serb Novak Djokovic 6-4, 6-4 to improve his record to 2-1 at the Masters Cup.
Justine Henin qualified for the WTA Championships semi-finals with a 6-2, 6-2 win over Jelena Jankovic.
World No 1 Novak Djokovic and the man who can dislodge him from the top spot by next week, Rafael Nadal, kicked off their China Open campaign with straight set victories on Tuesday.
Britain's Andy Murray and Russia's Mikhail Youzhny became the latest seeds to fall in the Kremlin Cup when they lost to lower-ranked opponents in the second round on Thursday.
The Belgian was joined by Svetlana Kuznetsova, Jelena Jankovic and Tatiana Golovin in the semi-finals of the Stuttgart Open.
Lindsay Davenport tasted defeat for the first time in a year on Saturday, losing 6-3 7-5 to second seed Jelena Jankovic in the China Open semi-finals.
Lindsay Davenport reached the semi-finals with an impressive 6-4, 2-6, 6-2 win over Jelena Jankovic.
Serena Williams withdrew before the start of her BNP Paribas Open.
Stuns World No 1 Djokovic to win 'biggest title of career'
World number three Novak Djokovic came back from a set down to beat unseeded Swiss Stanislas Wawrinka 4-6, 6-3, 6-3 and claim the Rome Masters title on Sunday.
World No 1 Novak Djokovic ended Kei Nishikori's impressive debut at the ATP World Tour Finals with a 6-1, 3-6, 6-0 semi-final victory at the O2 Arena on Saturday.
Serena Williams stayed on course for a fourth Sony Ericsson Open title with a ruthless 6-1 6-4 win over Czech Nicole Vaidisova in the quarter-finals on Wednesday.
The world number one beat China's Peng Shuai 7-5, 6-2 in the third round.
A tenacious Roberto Bautista Agut battled back to beat world number one Novak Djokovic 1-6, 7-5, 6-3 and advance to the quarter-finals of the Miami Open on Tuesday as the Spaniard claimed his second win over the Serb this year.