Britain’s Cameron Norrie and Johanna Konta both won to reach the second round of the Mexican Open.
Norrie, 23, beat Japan’s Yoshihito Nishioka 6-2 2-6 6-2, while Konta, 27, overcame Germany’s Laura Siegemund 6-3 6-2 in Acapulco.
Spain’s Rafael Nadal beat Germany’s Mischa Zverev 6-3 6-2 in his first match since losing the Australian Open final in January.
Nadal has reached the Mexico Open final in his three previous appearances.
“I’m happy for the victory. It’s never easy against Mischa, especially without competing for a while,” said 32-year-old Nadal, who will next face Australian Nick Kyrgios.
“This tournament is hard and there’s a lot of great players, so these kinds of matches can happen in the early stages.
“Nick is one of the most talented players on tour. It’s a big challenge for me and I hope to be ready for it.”
Zverev’s brother Alexander, the second seed, lost only one point on serve in a dominant 6-3 6-3 win against Alexei Popyrin.
Third seed John Isner served 18 aces in a 6-3 4-6 6-3 victory over France’s Adrian Mannarino.