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Since Wawrinka turned pro in 2002, the Swiss has won 16 tour singles titles. He beat the No. 1-ranked player in the finals of the 2014 Australian Open (Rafael Nadal), 2015 French Open (Novak Djokovic) and 2016 U.S. Open (Djokovic).
The ATP also says it will launch training for players, coaches and staff throughout next year.
Juan Carlos Ferrero thanked his protege and said he wished he “could have continued.”
The ATP Tour is adding a rule that will allow for 10-minute breaks during best-of-three-sets singles matches starting next season.