The 34-year-old beat the Spanish first seed 6-2 6-7(5) 7-6(5) in the ATP 250 clay court tournament, a day after he played in and lost his first doubles final on tour.
"I was nervous at the beginning but thank God I was able to win the first ATP (tournament) in Quito and the first for me," Estrella Burgos was quoted as saying by Ecuadorean daily El Comercio.
The world number 73 rated his good preparation for the rarefied air at nearly 3,000 metres in Quito, saying: "Today I felt as if I was playing at sea level. I felt very good on court."
(Writing by Rex Gowar in Buenos Aires. Editing by Patrick Johnston)
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