Brazilian Thiago Monteiro snuck in an upset before rain suspended play on Tuesday at the Ecuador Open in Quito.
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The 23-year-old knocked off fifth seed Horacio Zeballos of Argentina 6-4, 7-6(8), saving the only break point he faced in the one-hour and 39-minute match. Monteiro will next face either Italian lucky loser Alessandro Giannessi or Peter Polansky of Canada.
Spain's Roberto Carballes Baena beat Italy's Federico Gaio 7-6(5), 6-3 in the only other completed match of the day. Wednesday's play kicks off with seventh seed Ivo Karlovic facing Ernesto Escobedo of the U.S.A.