Sean Mannion, who started the first four games, had yielded to Vaz for two games after suffering a knee injury. Vaz won at BYU and beat Utah. Mannion came back and started at Washington last weekend, but threw four interceptions in the 20-17 defeat. Vaz replaced him and nearly rallied the Beavers to a victory.
Riley told reporters that starting Vaz is "best for the team right now."
"Cody is playing a little bit better right now," Riley said.