The 34-year-old Wawrinka, seeking his first ATP
trophy since he lifted the title in Geneva two years ago, served
17 aces -- one less than Lopez -- and converted one out of four
break-point opportunities to edge the tight match.
Up next for the world number 18 is unseeded Gilles Simon, who
powered past his French compatriot Jo-Wilfried Tsonga 6-4 7-5.
Wawrinka has beaten Simon four times in seven meetings but the
Frenchman prevailed in straight sets the last time they played
each other on the hardcourts of Shanghai in 2016.
Argentina's Guido Pella joined the duo in the last eight after
beating South Korea's Kwon Soon-woo 7-5 7-5 to set up a clash
with Ugo Humbert or second seed David Goffin.
In first-round action, Pablo Cuevas beat Hugo Dellien 6-4 6-3
and will take on Briton Andy Murray next. American Frances
Tiafoe overcame Germany's Yannick Maden 7-6(7) 6-3.
(Reporting by Shrivathsa Sridhar in Bengaluru. Editing by Ed
Osmond)
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