(Spanish pronunciation: [o'?asjo se'ßa?os]; born 27 April 1985) is a professional tennis player from Argentina on the men's circuit.
His career-high singles ranking is world no.
39.
His highest doubles ranking to date has been world no.
3 in September 2019.
He has played most of his tennis in Challenger events.
He qualified for the US Open and defeated Michael Berrer in the first round for his first win at Grand Slam level, and then lost to Tomáš Berdych in four sets in the second round.
He reached the final in the St.
Petersburg Open in Russia, losing to Ukrainian Sergiy Stakhovsky.
He also reached the doubles final at the Movistar Open in Santiago, Chile in 2010 with partner Potito Starace.
They lost to top seeds Lukasz Kubot and Oliver Marach.
He won the title in doubles at the Copa Telmex with Sebastián Prieto.
Zeballos won the 2009 ATP Newcomer of the Year award on 17 February 2010.
Zeballos won his first pro title in 2013 at the VTR Open in Chile on 10 February.
In the final, he beat Rafael Nadal, becoming one of only four players (with Roger Federer, Novak Djokovic and Andy Murray) to beat Nadal in a clay-court final.