Winning by nearly a full second, Rio Mesa posted a time of 1 minute, 26.79 seconds, which ranks No. 13 in the nation.
Jordan Nunnery was placed in a loaded lineup this week, joining Blake Selig, Darion Zimmerman and Cameron Roach. The same team is expected to compete in the invitational 4×100 relay today.
Oaks Christian placed seventh in 1:31.84.