Oak Harbor fell behind early and was unable to recover in its 54-33 loss to St. Mary CC.
The Rockets, who fell to 5-13 overall and 0-11 in the Sandusky Bay Conference with the loss, trailed 27-17 at halftime before the Panthers outscored them, 27-16, in the second half.
Denarius Harris led SMCC with 18 points and Brett St. Clair and Lucas Will finished with 10 points apiece.
Oak Harbor got nine points from Andre Ramsey and eight from Andy Rathbun.
The Rockets host Perkins on Friday and travel to Marblehead to face Danbury on Saturday. In the tournament drawings, Oak Harbor was matched up with Port Clinton. The two will face each other in the Division II Sectional Semifinal on Feb. 25 at 6:15 p.m. at Willard High School. The winner faces Clyde, the No. 2 seed, at 6:15 p.m. on Feb. 28, also at Willard High School.