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Andy Murray says the Australian Open could be his final tournament.

Social Media Reacts To Murray's Retirement Announcement

Delpo, Anderson, Khachanov among the ATP Tour stars who react

ATP Tour stars, coaches, former players and other sports stars reacted with sadness and words of encouragement to the news that Andy Murray could be playing his final tournament at the Australian Open, which starts Monday. The Scot said during a news conference on Friday that the pain in his right hip has become too much for him to endure, and that he plans to retire after Wimbledon, if not sooner.

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ATPTour.com compiled the best of social media's reaction to the news: