Donald Young reached his third quarterfinal in four ATP events this year with a 6-3, 6-2 win over Alejandro Gonzalez of Colombia at the Delray Beach Open on Thursday.

The 25-year-old American, who was the No. 1-ranked junior in the world in 2005 but has struggled in the professional ranks, has never before made three quarterfinals in an entire season. In January, he advanced to the quarters in Auckland, New Zealand, and last week he was a semifinalist indoors in Memphis.

Young will play third-seeded Alexandr Dolgopolov of the Ukraine or unseeded American Tim Smyczek for a spot in the semifinals.