Calvert took two of the three singles matches, but Oak Harbor swept the doubles matches to sneak past the Senecas 3-2.
Calvert (1-4) picked up wins from CeCi Burtis against Emily Goff 6-2, 6-1, and Margaret Bowers against Ashley Gallardo 6-0, 6-1.
Oak Harbor picked up a victory at No. 1 singles from Ashley LaFountain 6-1, 6-0 over Madison Daniel.
In doubles action, Jessica Hymore and Amanda Sosa beat Samantha Gase and Stasia Huth-Fretz 7-6, 6-0. Rachel Helle and Emily Boss beat Regina Hoepf and Nicole Fretz 6-2, 4-6, 6-4.
Tornadoes rout Rams
UPPER SANDUSKY - Columbian had little trouble with Upper Sandusky in a make-up match Monday. No Tornadoes lost a set and collectively lost only seven games in the match.
Alex Kramer blanked Taylor Clark at No. 1 singles 6-0, 6-0. Kelly Bishop beat Kilee Saylor, and Sarah Guzowski beat Jenny Ohler by identical 6-2, 6-0 scores.
In doubles, Allie Elchert and Audrey Vrancken beat Logan Pierson and Taylor Dilley 6-1, 6-1. Kelsey Drown and Ashley Niedermier beat Nadia English and Megan Pasco 6-1, 6-0.
Fostoria blanked by Napoleon
FOSTORIA - Napoleon posted a shutout in singles action against Fostoria winning all three matches by 6-0, 6-0 scores. Rachel Niermann beat Alyssia Sandoval, Addie Small beat Pernille Knudsen and Courtney Smith beat Lauren Risner.
In doubles action, Haley Altman and Lauren Saputo beat Kendall McCody and Cori Garrett 6-4, 4-6, 6-3. Kelsey Vondeylen and Amber Gruenhagen beat Autumn Affolder and Angelica Esquivel 6-1, 6-3.