Stefanos Tsitsipas beat Damir Dzumhur, 6-1 6-4, at the Miami Open to set up a match with Kei Nishikori.
The Greek world number five needed just an hour and eight minutes to progress.
The Japanese veteran made his way through to the next round when he defeated Aljaz Bedene.
Laver Cup
Laver Cup takeaways: Djokovic returns in style, Federer's emotional farewell, Nadal injury worry
Nishikori had to play through almost three hours to beat the Slovenian 31-year-old 7-6 (6) 5-7 6-4.

'I was rooting for Tsitsipas' - Osaka after second title in Melbourne

Elsewhere, Milos Raonic had little difficulty beating Jordan Thompson 6-2 6-1, while Ugo Humbert will face him in the next round after beating Joao Sousa 6-1 6-4.
Marin Cilic defeated Cristian Garin over three sets, Sebastian Korda beat Fabio Fognini 1-6 6-4 6-2.
Daniel Elahi Galan beat Alex De Minaur 4-6 6-3 6-4. Experienced Frenchman Benoit Paire was sent home by teenager Lorenzo Musetti 6-3 6-3.

'Take a bow' - The best of Tsitsipas at 2021 Australian Open

Laver Cup
'No one beats Team World five times in a row' - McEnroe overjoyed with Laver Cup success
Laver Cup
Highlights: Tiafoe roars back to beat Tsitsipas and clinch Laver Cup triumph for Team World