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This season was the breakthrough year for Dayana Yastremska. A career-high ranking and two title wins set the 19-year-old up for success next year. And now, she has a new coach to guide her.

Sascha Bajin, who fans may know as the coach of Naomi Osaka who propelled the Japanese player into two Grand Slams and world No. 1 status, is now the force behind Yastremska. Her previous coach was Olivier Jeunehomme, who is affiliated with the Justine Henin Tennis Academy where Yastremska trains.

Before the new season, and possibly before Yastremska's rise through the rankings, test your knowledge on the Ukrainian's career.