Ahead of his victory, the 21-year-old Dane edged out Italian wildcard Matteo Berrettini (2-6, 6-1, 6-4) and won against Portuguese qualifier Nuno Borges (6-3, 7-6 (8)).

Monfils, ranked No 46, defeated Australian Alexei Popyrin (7-5, 6-3) and edged out Spaniard Carlos Alcaraz, the second seed (4-6, 7-6 (5), 6-4) earlier in the tournament.

Cincinnati Masters 1000, other last 16 results (Lindner Family Tennis Center, hard, USD 6.795.555, most recent results first):

• Frances Tiafoe vs. Jiri Lehecka
• Felix Auger-Aliassime vs. Jack Draper: friday
• Hubert Hurkacz (5) beat Flavio Cobolli: 6-3, 3-6, 6-1
• Ben Shelton (12) beat Fabian Marozsan: 6-4, 6-3
• Jannik Sinner vs. Jordan Thompson
• Andrey Rublev (6) beat Brandon Nakashima (WC): 7-6 (5), 6-1
• Alexander Zverev (3) beat Pablo Carreno Busta: 7-5, 7-6 (6)