Australian Open: Caroline Wozniacki crashes out

Updated 1448 GMT (2248 HKT) January 18, 2016
 Caroline Wozniacki Australian Open 2016 Caroline Wozniacki Australian Open 2016
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Former world No. 1 Caroline Wozniacki crashed out of the tennis season's opening grand slam after a shock defeat by Kazakhstan's Yulia Putintseva, ranked 58 places below the Dane. Michael Dodge/Getty Images AsiaPac/Getty Images
Fans attempt to catch a stray tennis ball during the match between Wozniacki and Putintseva. Michael Dodge/Getty Images
Defending champion Serena Williams got off to a better start than Wozniacki, beating Italy's Camila Giorgi 6-4 7-5. Ahead of the start of the Australian Open, the world No. 1 had been troubled by a knee injury. SAEED KHAN/AFP/Getty Images
Last year's losing finalist Maria Sharapova celebrates after an easy victory in her first-round match against Japan's grand slam debutante Nao Hibino. Zak Kaczmarek/Getty Images AsiaPac/Getty Images
Last week play had been suspended during qualifiers due to excessive heat. On Monday temperatures reached 35 Celsius (95 Fahrenheit), Michael Dodge/Getty Images
World No. 1 and reigning Australian Open champion Novak Djokovic of Serbia cruised to a straight-sets victory over South Korea's Hyeon Chung. Cameron Spencer/Getty Images AsiaPac/Getty Images
Australian Nick Kyrgios blitzed Spain's Pablo Carreno Busta 6-2 7-5 6-2 to cruise into the second round. Michael Dodge/Getty Images AsiaPac/Getty Images
Friend and fellow Australian tennis star Thanasi Kokkinakis, center, looks on as Kyrgios won his first-round match. The 19-year-old Kokkinakis, one of the youngest players in the world top 100, suffered a shoulder injury in December that ruled him out of the tournament. Michael Dodge/Getty Images
Canada's Eugenie Bouchard had a difficult 2015 season after reaching the quarterfinals in Melbourne, but made a positive start to this year's event by defeating Serbia's Aleksandra Krunic 6-3 6-3. Scott Barbour/Getty Images
Switzerland's third seed Roger Federer, seeking his fifth Australian Open title, acknowledges the crowd after winning his first-round match against Georgia's Nikoloz Basilashvili. Cameron Spencer/Getty Images AsiaPac/Getty Images
Melbourne Park's main stadium, the Rod Laver Arena, is pictured during the first-round match between Kristyna Pliskova and Australian 25th seed Samantha Stosur, which was won by the Czech player. Cameron Spencer/Getty Images