Monmouth Academy pulled off a mild upset with a 62-53 victory over the Old Orchard Beach boys basketball team to earn a place in the Class C South quarterfinals.

Monmouth Academy improves to 11-8 while Old Orchard Beach falls to 9-10.

Monmouth Academy will play No. 1 Winthrop at 9 p.m. on Monday, Feb. 17 at the Augusta Civic Center.

Both teams reached the quarterfinals last year.