Belgian qualifier David Goffin extended his unbeaten streak to 25 matches this afternoon, defeating No. 15 seed Jarkko Nieminen 6-4, 4-6, 6-4 in the third round at the Winston-Salem Open. Goffin’s unbeaten run, following a first round loss to Andy Murray at Wimbledon, includes three straight Challenger Tour titles , a Tour-level title at Kitzbuhel, and five matches in Winston-Salem, including two in qualifying. Goffin, ranked No. 62, had knocked off defending champion Jurgen Melzer on Monday and No. 4 seed Leonardo Mayer yesterday. “It was a tough match today against Jarkko,” Goffin said. “It was a great fight and I’m really happy the way I played at the end to win this match. Of course after 25 matches you have a lot of confidence, you don’t think you’re going to lose, but I play every match like it’s the first one in the tournament, like it’s the first one of the season and I give everything. And with my confidence I keep winning, so I’m very happy.” Goffin raced to 5-1 lead in the first set, complements of breaks in the first and third games, as the No. 54-ranked Nieminen started slowly. The 33-year-old Finn shook off his lethargy in the eighth game, getting one of the breaks back, but by then it was too late as Goffin served out the opener in 33 minutes. Service prevailed through the first nine games of the second set, as the revived Nieminen, formerly No. 13 in the world, played like the crafty veteran he still is. Nieminen broke the Belgian with ease in the 10th game to even the match at a set apiece. Goffin regained the form he exhibited in the first seven games of the opening set to take control of the third, breaking in the fifth game and holding throughout, while not facing a break point. It was over after one hour and 44 minutes. Each player served six aces and won 78 percent of their first service points. Goffin committed seven double faults to two for Nieminen, but won 54 percent of his second service points to 44 percent for the Finn. Goffin faces fellow 23 year old Jerzy Janowicz in the quarterfinals tomorrow.