Serena Williams beat her sister Venus in the final to win the Australian Open in January
Serena Williams, the most successful female player of the Open era, is pregnant - just 12 weeks after winning her record 23rd Grand Slam.
The American, 35, is due to give birth in the autumn, says her representative.
Novak Djokovic saved just one of seven break points against Gilles Simon
World number two Novak Djokovic won on his return to the tour as he beat France's Gilles Simon in his opening match of the Monte Carlo Masters.
The Serb, playing his first clay match of the year after recovering from an elbow injury, won 6-3 3-6 7-5.
Murray (right) and team have been practising in Monte Carlo for the past week
Andy Murray and Novak Djokovic will return to the tour at the Monte Carlo Masters this week after recovering from elbow injuries.
World number one Murray last played in Indian Wells on 12 March, and will resume against Gilles Muller or Tommy Robredo on Wednesday.
Petra Kvitova's last appearance on court was against France's Caroline Garcia in the Fed Cup final on 12 November
Petra Kvitova says she has a "chance" of making a shock return from a career-threatening hand injury at the French Open next month.
The Czech suffered damage to tendons and nerves in her left hand after she was stabbed by an intruder at her home in Prostejov in December.
Roger Federer has won 19 of his 20 matches this season
Roger Federer overcame long-term rival Rafael Nadal to win the Miami Open for the third time and continue his remarkable start to the season.
The 35-year-old built on January's Australian Open win and his March Indian Wells success with a convincing 6-3 6-4 win over the Spaniard.
