ATLANTA (AP) _ Giorgis Sigalas scored 22 points Friday and Greece clinched a quarterfinal berth in the Olympic men's basketball tournament with a 108-86 victory over South Korea.

Greece (3-1), making its first Olympic appearance, can finish no worse than fourth in its six-team pool. The top four teams in each group advance to the quarterfinals.

South Korea (0-4) led 21-20 when Greece went on a 13-2 run to take a 33-23 lead with 9:36 left in the first half. Fragiskos Alvertis had two 3-pointers in the run and Sigalas added a 3-pointer and a jumper.

Greece, which led 56-44 at halftime, opened the second half with a 10-2 run with Sigalas scoring all but two of the points.

Alvertis finished with 19 points and was 3-for-4 from 3-point range, while Sigalas was 3-for-6 from beyond the arc. Greece finished 7-for-14 from 3-point range.

Joo-Yeop Hyun had 24 points for South Korea, which was outrebounded 45-23.