CoCo Vandeweghe reached her career-high singles ranking of world No. 9 on January 15, 2018.
In addition to Vandeweghe's two Grand Slam semifinals in 2017 at the Australian Open and the US Open, she has twice reached the quarterfinals at Wimbledon in both 2015 and 2017. Vandeweghe also owns one Grand Slam doubles title, which she won at the 2018 US Open with partner Ashleigh Barty. Vandeweghe is known to have one of the strongest serves on tour. In 2014, she hit 306 aces, third-highest on tour. – Wikipedia