St. Mary's upended visiting DuBourg 8-2 Tuesday.
Cory Macke of DuBourg went 3-for-3 with an RBI and one run scored. Kyle Colombini suffered the loss for DuBourg.
St. Mary's (3-7) plays Maplewood-RH at Deer Creek Park on Thursday at 4:30 p.m. DuBourg (4-8) will play Cardinal Ritter at Harris-Stowe on Thursday at 4 p.m.