Mervo's boys won the first swimming championship in the history of their school and City won the girls title at the Baltimore City Swimming Championships Saturday at Towson University.
Both teams earned wins from their distance freestylers, with Mervo's Patrick Beverly and City's Anna Shafer winning the 500-yard freestyle events.
The Mustangs defeated Poly for the title, 417-386, with Digital Harbor finishing third with 254 points.
City won the girls title over Western, 412-376, with Poly third (329 points).
Four athletes won two individual events. For the girls, Western's Derricka Franklin won the 100 freestyle and the 100 butterfly and Poly's Alexandria Mitias won the 50 free and the 100 butterfly.
In the boys' meet, Poly's Isaac Spokes won the 200 individual medley and the 100 butterfly and Douglass' Navon Warren won the 50 freestyle and the 100 free.