World number two Aryna Sabalenka says her "heart is broken" after the death of her former boyfriend this week.
Konstantin Koltsov, a former ice hockey player, died at the age of 42 in Miami on Monday in what police have described as an "apparent suicide".
On Wednesday, Sabalenka issued a statement saying Koltsov's death was "an unthinkable tragedy".
The 25-year-old Belarusian, who is a two-time Grand Slam champion, is set to play in the Miami Open this week.
"Konstantin's death is an unthinkable tragedy, and while we were no longer together, my heart is broken," Sabalenka wrote in an Instagram post.