Seventh seed Roger Federer has part ways with his American coach for more than three years Paul Annacone.
The 17-time Grand Slam champion and Annacone began their partnership in July 2010, during which the Swiss has gone on to win 13 titles.
However, 32-year-old Federer has had a disappointing 2013 season, failing to reach any of the Grand Slam’s final and dropping to his lowest ranking since October 2002.
“After numerous conversations, we felt this was the best time to path for both of us,” he said.
Federer added that their aim since the day they started working together was to win another Grand Slam and regain the top ATP ranking, both of which have been achieved.
“Paul remains a dear friend,” Federer added.
Severin Luthi, another of the Swiss’ coach attended the Shanghai Masters with him, where he was beaten in the third round by Gael Monfils on Thursday.
The Garry Weber Open in Halle, Germany is the only tournament claimed by Federer in 2013.