“Despite the success of the cooperation since the start of the season, this step is needed because of differences of opinion as the future direction,” a statement read.

Former coach of Kim Clijsters (2009-11), current world number one Simona Halep (2014) and Victoria Azarenka (2015-16), Fissette joined forces with Kerber in November 2017.

With the Belgian by her side, the 30-year-old Kerber, who reached No.1 in the rankings in 2016 but now sits third, reached the semi-finals of the Australian Open before going on to win Wimbledon

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