Fourth seed Stefanos Tsitsipas defeated Italian Lorenzo Sonego 7-6(4), 6-3 to advance to the second round of the Dubai Duty Free Tennis Championships.
The Greek will next face world No. 24 Karen Khachanov, who eased past Daniel Evans 6-1, 6-3.
Elsewhere, Australian Alexei Popyrin defeated Lebanese wild card Hady Habib 6-2, 6-4, to set up a second round clash with No. 2 seed Alex de Minaur.
Roberto Bautista Agut, the 2018 champion, also advanced, overcoming Fabian Marozsan 3-6, 6-3, 7-6(4), while Zizou Bergs registered a 6-3, 6-3 win against Tunisian wild card Aziz Dougaz.
Arsenal defeated London rivals Chelsea 1-0 for their first win in four Premier League games on Sunday as a headed goal by stand-in striker Mikel Merino boosted their faint hopes of catching up with runaway leaders Liverpool.
Carlos Alcaraz's hopes of capturing a third successive Indian Wells title went up in smoke on Saturday and the Spaniard said his inability to tame his nerves was more of a disappointment than the stunning semi-final defeat by Jack Draper.
McLaren's Lando Norris swept to victory in a wet and wild Australian Grand Prix on Sunday, holding off defending champion Max Verstappen in a white-knuckle finish to a Formula One season-opener littered with crashes and safety cars.
Manchester City could only muster a 2-2 Premier League draw with Brighton & Hove Albion on Saturday, dropping points in a blow to their hopes of playing European football next season.
After struggling with setup issues through Australian Grand Prix practice, Max Verstappen was surprised by his Red Bull car's performance on Saturday as the Formula One defending champion took third place in qualifying for the season-opening race.