American teen Donald Young is in the hunt for his second junior Grand Slam title.

The 17-year-old Young, the fourth seed, got closer to that goal Friday by defeating 11th-seeded Pavel Chekhov of Russia 7-6 (7-1), 6-3 to gain one U.S. Open junior boys semifinal.

Young, who won the 2005 Australian Open junior title and was named the 2005 ITF Junior Boys' Champion, will end his junior Grand Slam career at this U.S. Open.

``Donald played very well against a tough opponent today, which bodes well for him the rest of the event,'' said Rodney Harmon, director of Men's Tennis for USTA Player Development.

``There's a lot of good players still in it so he'll have to play at a high level since there's still a ways to go.''

To get to the final, Young will have to beat Peter Polansky, who upset top-seeded Martin Kizan of the Slovak Republic in the first round.

Young, who is 0-10 in ATP tour-level matches, won his first set in the big leagues in his four-set, first-round loss to Novak Djokovic as a wildcard in the U.S. Open men's draw last week.

Harmon says Young, who is ranked No. 577 on the ATP computer, belongs in the minor leagues of tennis for the immediate future.

``He's going to be playing Challengers this fall, which is good,'' Harmon said. ``That's the right level for him and I think he'll do fine.''