Novak Djokovic is the latest top player to pull out of the event.
The Swiss Maestro has called for more to be done to address the issue of social media abuse.
The former world No.1 has vowed to stay involved in the team event he helped create for years to come.
The 40-year-old has provided an update on his current health during a sponsorship event in Zurich.
Rafael Nadal and Roger Federer will miss the rest of the season due to foot and back injuries respectively.
Further surgery is set to sideline the Swiss Maestro from the Tour for 'many months' as he faces a very uncertain future.
The Swiss maestro will not play another tournament this year and it is unclear as to when he will return to the Tour again.
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The Swiss star is still unsure about when he will return to the Tour as he embraces life as a 40-year-old.
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