Dubai ATP results on Sunday (x denotes seeding): 1st rd Kei Nishikori (JPN) bt Reilly Opelka (USA) 3-6, 6-3, 6-4 Jeremy Chardy (FRA) bt Albert Ramos Vinolas (ESP) 6-3, 3-6, 6-4 Alexei Popyrin (AUS) bt Dennis Novak (AUT) 7-6 (7/3), 7-5 Aslan Karatsev (RUS) bt Egor Gerasimov (BLR) 6-4, 6-4 Alexander Bublik (KAZ) bt Yoshihito Nishioka (JPN) 6-4, 7-6 (7/4) Malek Jaziri (TUN) bt Jo-Wilfried Tsonga (FRA) 3-3 - retired afp