Osaka sacks her second coach of 2019

FILE PHOTO: Sep 2, 2019; Flushing, NY, USA; Naomi Osaka of Japan reacts after losing a point against Belinda Bencic of Switzerland (not pictured) in the fourth round on day eight of the 2019 US Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Geoff Burke-USA TODAY Sports

(Reuters) - Twice Grand Slam champion Naomi Osaka has sacked her second coach in seven months, splitting with Jermaine Jenkins in the wake of her disappointing U.S. Open title defence.

Jenkins, a long-time hitting partner of Venus Williams, replaced Sascha Bajin in February, weeks after Osaka's Australian Open triumph.