The 18-year-old American was diagnosed with Hodgkin's lymphoma prior to Wimbledon.
Players used social media in expressing their thoughts on the Chinese star's retirement.
18-year-old Australian, who won 2011 Wimbledon Girls title, announced an indefinite hiatus.
Cilic return to his hometown in Bosnia and Herzegovina for the first time since becoming a Grand Slam champion.
Get a detailed look at Halep's 2014 season in this fun infographic.
Nicole Vaidisova won her first professional match in nearly five years.
The ATP has announced that the 2014 Barclays ATP World Tour Finals will kick off with an event in support of the male cancer awareness charity, One For The Boys.
