Thomaz Bellucci is proving that he’s no underdog…

The 24-year-old Brazilian tennis player upset top-seeded Janko Tipsarevic in the Swiss Open final on Sunday.

Unseeded in the tournament, Bellucci came back after dropping the first set in a heartbreaking tiebreak to win 6-7 (6), 6-4, 6-2.

Bellucci was leading 6-1 in the first-set tiebreaker, before Tipsarevic reeled off seven points for the set. At 5-4 in the second, Bellucci broke the eighth-ranked Serbian’s serve to love to even the match.

In the final set, Tipsarevic saved two match points but double-faulted to present a third, which Bellucci won.

The victory earned Bellucci, currently ranked No. 60 in the world, his third career title and second at Gstaad. He won the clay-court event as a qualifier in 2009.

Meanwhile, Tipsarevic was denied a second straight title after winning on clay last week at Stuttgart, Germany, where he beat Bellucci in the semifinals.

Bellucci and Tipsarevic will compete in the London Olympics at Wimbledon.