Serena Williams could become only the fourth mother in the Open Era to win a Grand Slam title after Aussies Margaret Court and Evonne Goolagong Cawley and Belgium's Kim Clijsters.
Sania Mirza and Shoaib Malik had a baby son in October.
Other tennis stars like Serena Williams and Kim Clijsters played tennis after becoming a parent.
Kim Clijsters had asked the crowd where she should serve to win the point. A male fan in the crowd shouted "body". Clijsters then invited the man to play a point.
The 6-1, 4-6, 6-3 win over Roger Federer was Lleyton Hewitt's 29th title on the ATP tour but his first since 2010.
In what could be a dress rehearsal for the Australian Open final, Williams won a close first set then edged Azarenka in the second to win 6-4, 7-5 in 98 minutes.
Roger Federer was outplayed for large parts of the match but lifted when it mattered to beat the eighth seeded Chardy in three sets 6-3, 6-7 (3/7), 6-3.
Serena Williams' 6-2, 7-6 (7) win against Maria Sharapova helped her set-up a title clash against Victoria Azarenka.
The top seeded Roger Federer booked a semi-final against France's Jeremy Chardy with his imperious 57-minute 6-1, 6-1 win over an outclassed Marinko Matosevic.
Victoria Azarenka will now face Serena Williams who beat third-seeded Maria Sharapova, for the title.
An out-of-sorts Gilles Simon, who had a first round bye, was unable to make any impression on Marius Copil during the 7-5, 6-3 loss.
While Serena Williams cruised to an easy 6-3, 6-3 win over Diminika Cibulkova, Maria Sharapova took two hours to go past 2012 Brisbane champion Kaia Kanepi.
The 32-year-old Swiss star is not suddenly turning to a serve-volley mindset, but he did venture to the net with good effect in his second-round match against Nieminen as he honed certain parts of his game.
Maria Sharapova had not played since a shoulder injury forced her off the tour in August, but she made up for lost time when she beat Garcia 6-3, 6-0 in just 64 minutes on Pat Rafter Arena.
Caroline Garcia of France had no answer to a ruthless Maria Sharapova who crushed her 6-3, 6-0 in just a little over an hour.
Serena Williams had only four losses in a stellar 2013, a year that included her 16th and 17th Grand Slams at Roland Garros and the US Open.
Sabine Lisicki defeated Slovakia's Magdalena Rybarikova 6-3, 6-4 in 89 minutes to enter the second round of Brisbane International.
The former world number one hurt her shoulder during training and decided to pull out of Brisbane to avoid the risk of further damage.