With an upset of the No. 2 seed on the road on Wednesday, the River Valley High girls tennis team moved into the Sac-Joaquin Section Division IV girls final set for Wednesday at University of Pacific in Stockton. River Valley, seeded third, was one of two upset victories when it pulled out a 5-4 win over No. 2 El Capitan in Merced. “We started with strong performances from our top-4 singles …