He will skip the two Masters series events in Shanghai and Paris next month.
Rediff.com presents the early surprises at the year's first Grand Slam.
Defending champion Donna Vekic, of Croatia, earned a hard-fought win over British wild card Gabriella Taylor 7-5, 5-7, 7-6(3).
Former world number one Maria Sharapova eased past defending champion Peng Shuai 6-3, 6-1 at the Tianjin Open on Saturday to reach her first WTA final in almost two and a half years.
Nick Kyrgios needs to improve his fitness to have a chance of winning Grand Slams, former world number one Jim Courier said on Wednesday.
Big-serving Isner reaches Montreal second round
A ruthless Sorana Cirstea took full advantage of Karolina Pliskova's patchy form at the China Open on Thursday, reaching the quarter-finals as she consigned the recently dethroned world number one to a 6-1, 7-5 defeat.
'This was the first time that I played points and that was too much for me today'
Images from the Australian Open matches played at Melbourne Park on Wednesday.
World number one Simona Halep swatted aside American Nicole Gibbs while Maria Sharapova was flawless in her straight sets victory over Romania's Mihaela Buzarnescu in the opening round of the Shenzhen Open on Monday.
Former world number one Karolina Pliskova utilised her big serve to full effect to ease to a 6-4, 6-4 victory over home favourite and U.S. Open champion Naomi Osaka in the Pan Pacific Open final in Tokyo on Sunday.
Ukrainian fourth seed Elina Svitolina powered into the third round of the U.S. Open with a 6-4, 6-4 win against Russian Evgeniya Rodina on Thursday.
Coco Gauff claimed the biggest win of her young career on Friday with a stunning upset of defending champion Naomi Osaka at the Australian Open to reach the fourth round. Caroline Wozniacki and Serena Williams also lost their respective matches earlier in the day. Images from Day 5 of the Australian Open played at Melbourne Park on Friday.
Former world number one Novak Djokovic suffered a surprise second-round exit at the Barcelona Open when the Serb was beaten 6-2, 1-6, 6-3 by world number 140 Martin Klizan on Wednesday.
Former world number one Andy Murray withdrew from the Brisbane International with a hip problem on Tuesday, further putting in doubt the Briton's prospects of being fit in time for the Australian Open later this month.