Joplin suffered a 3-0 setback to Willard on Thursday night inside Kaminsky Gymnasium.
The Tigers beat the Eagles 25-12, 25-19, 25-21.
It was Senior Night for the Eagles, as Angelina Schramm, Allie Lawrence, Logan Bruggeman, Sydney Walker, Kacy Coss and Emma Floyd were recognized.
Willard improved to 25-3-1.
Joplin (12-11-5) is at Neosho on Tuesday in the regular season finale.