In his first match of the 2021 season, the No. 1-ranked Serb beat the Canadian No. 1 in two tight sets to extend his winning streak in Australia to 21 matches. He then took the court again to lead Serbia to a 2-1 victory in the tie.

Monfils, Novak (not that one) and Berrettini will be out to help their countries advance at the ATP Cup.

Dominic Thiem has long had one of the most dynamic games in tennis, and heading into the 2020 season, he now has a hairstyle to match—with blond tips in the vein of an early 2000s singer, or a late-'90s Roger Federer.