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The world No 6 secured a comfortable 4-0 victory to wrap up the day’s proceedings.
Stefanos Tsitsipas breaks into song during Ultimate Tennis Showdown changeover
Richard Gasquet beat Corentin Moutet 3-1 in the opening match of the day before Dominic Thiem overcame Matteo Berretini by the same scoreline.
Berrettini recovered from two points down with 20 seconds to go to force a deciding point, but Thiem came out on top to secure his third win in a row.
Dominic Thiem beats Matteo Berrettini to extend winning run at UTS
David Goffin was also victorious as he beat Elliot Benchetrit, who replaced the injured Dustin Brown, while Feliciano Lopez was too strong for Benoit Paire.
Quarter-finals, Day 1