Tommy Paul (7), United States, def. Andrey Rublev, Russia, 7-5, 6-2.

Adrian Mannarino, France, def. Ignacio Buse, Peru, 0-6, 7-5, 6-4.

Carlos Alcaraz (2), Spain, def. Karen Khachanov, Russia, 6-4, 7-6 (5).

Alexander Zverev (1), Germany, def. Martin Landaluce, Spain, 7-5, 3-6, 7-6 (11).

Cameron Norrie, Britain, def. Francisco Cerundolo, Argentina, 6-4, 6-1.

Flavio Cobolli (4), Italy, def. Grigor Dimitrov, Bulgaria, 6-4, 3-6, 6-3.

Maximo Gonzalez and Andres Molteni (2), Argentina, def. Santiago Gonzalez, Mexico, and Bart Stevens, Netherlands, 7-5, 6-3.

Luke Johnson, Britain, and Sander Arends (1), Netherlands, def. Maximilian Neuchrist, Austria, and Skander Mansouri, Tunisia, 7-5, 7-6 (6).