World number one Carlos Alcaraz claimed a hard-fought win while Novak Djokovic also triumphed as the pair advanced at the Cincinnati Open.
The 20-year-old Spaniard gained revenge on in-form Tommy Paul 7-6 (8-6) 6-7 (0-7) 6-3 after the American had beaten the Spaniard this month in Toronto.
World number two Djokovic maintained his unbeaten record against France's Gael Monfils, winning 6-3 6-2.
The top-ranked pair are preparing for the US Open, which begins on 28 August.
23-time Grand Slam champion Djokovic, a two time winner in Cincinnati, dominated the baseline rallies and made the most of a loose service game from his long-time rival to break to love at 5-3 in the first set.