Frances Tiafoe is an American right-hander known for his flair, athleticism and crowd-pleasing charisma on court. The son of immigrants from Sierra Leone who worked at the tennis center where he learned to play, he broke through with a run to the US Open semifinals, defeating Rafael Nadal along the way, and has become one of the most popular players on the US tour with his energetic celebrations and all-court, improvisational style.