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.