Temperatures rose to 41 degrees Celsius (108 degrees Fahrenheit) during Tuesday's matches
Maria Sharapova takes a drink between gamesAaron Favila/The Associated Press
Bethanie Mattek-Sands pours water to her neck as she sits in her chair between gamesAaron Favila/The Associated Press
Tennis fans protect themselves from the sun during a first round match at the Australian OpenAaron Favila/The Associated Press
Kei Nishikori wraps an ice pack around his headAaron Favila/The Associated Press
Taiwan's Chan Hao-ching with ice pack on her headShuji Kajiyama/The Associated Press
Yaroslava Shvedova receives treatment by trainersAaron Favila/The Associated Press
Fabio Fognini cools down in a fountain in central Melbourne as temperatures topped at 43 C (108 F) at the Australian OpenFiona Hamilton/The Associated Press
Juan Martin del Potro cools off with the help of ice pack during a breakAndrew Brownbill/The Associated Press
Canada’s Frank Dancevic applies an ice pack to his head after collapsing during his first round matchAijaz Rahi/The Associated Press
Canada’s Frank Dancevic lies on the court after collapsing during his first round matchAijaz Rahi/The Associated Press
Canada’s Milos Raonic cools himself with an ice pack during a breakAijaz Rahi/The Associated Press
Daniel Gimeno-Traver assists an official in helping a ball boy who collapsed during his men's singles matchBRANDON MALONE/Reuters
Caroline Wozniacki pours water over her head during her women's singles matchDAVID GRAY/Reuters
Lourdes Dominguez Lino wraps an ice pack around her face during a break in her first round matchRick Rycroft/The Associated Press