It takes a lot to impress 24-time Grand Slam champion Novak Djokovic, but this does.
The two-time major champion has long been a mentor to Rublev.
The Togliatty, Russia native announced her switch on social media.
The American converted his seventh match piont against Matteo Berrettini to win in Miami.
The Czech teen powered past Arthur Fils in Miami.
A stunning, running forehand pass from Grigor Dimitrov sparked his pulsating comeback win in Miami.
"She was pretty loosened up and just went for it," Iga Swiatek said after falling to 140th-ranked wild card Alexandra Eala in Miami.
