This year's Australian Open has been dubbed the Australian Oven as the heat caused players and a ball boy to collapse. Organisers said temperatures peaked at 42.2 degrees Celsius in the early evening on Tuesday.
The scorching heat at Melbourne Park prompted players to cool off between points with bags of ice on their heads or draped over their necks. Little relief was expected this week, with similar heat forecast until Friday
Canadian qualifier Frank Dancevic criticised tournament organisers for forcing players to compete in "inhumane" condition. He fainted during the second set of his first round match against France's Benoit Paire and passed out for a minute.
A ball boy required medical attention after collapsing during Milos Raonic's 7-6(2) 6-1 4-6 6-2 victory over Daniel Gimeno-Traver.
Caroline Wozniacki said it was hot enough to melt her water bottle: ''I put the bottle down on the court and it started melting a little bit underneath. It felt like I was playing in a sauna.''
The tournament's "extreme heat" contingency plan was put into force for women's matches on Tuesday, allowing an extra 10-minute break between the second and third sets, but officials said the majority of matches were completed without calls for medical attention.

ball boy collapse
An official attends to a ball boy who collapsed during the match between Daniel Gimeno-Traver and Milos Raonic as temperatures rose to 41 degrees Celsius (108 degrees Fahrenheit) at the Australian Open 2014 tennis tournament in Melbourne.Reuters
Frank Dancevic of Canada receives medical attention after he collapsed during the second set of his match against France's Benoit Paire on the uncovered court six at Melbourne ParkReuters
jelena jankovic
Jelena Jankovic of Serbia places an ice pack on her neck during her match against Misaki Doi of JapanReuters
kei nishikori
Kei Nishikori of Japan wraps his head in a towel packed with ice during a break in play during his match against Marinko Matosevic of AustraliaReuters
cooling down
Left: Spectators shade themselves from the sun during the women's singles match between Venus Williams and Ekaterina Makarova. Right: A girl holds her hat in front of a mist fanReuters
umbrella hats
Fans of Australians Jacqui Barton and Clare Ussher wear umbrella hats as they watch the tennis on Margaret Court ArenaReuters
cooling down
From left: Kiki Bertens, Ana Ivanovic and Caroline Wozniacki try to cool down during their first round matchesReuters
medics man collapse
Medics attend to a man who collapsed due to overheating at the Australian Open 2014 tennis tournamentReuters
venus williams
Venus Williams cools down with a bag of ice during her match against Ekaterina MakarovaReuters
children fountain
Children cool off in a fountain at Melbourne ParkReuters
fans hats
Fans shelter from the sun during the men's singles match between Alejandro Gonzalez of Colombia and David Ferrer of SpainReuters