CORVALLIS — Ryan Dunn's go-ahead single with one out in the ninth inning gave the 19th-ranked Oregon State baseball team a 6-5 victory over fifth-ranked Arizona on Friday in the their series opener at Goss Stadium.

CORVALLIS — Ryan Dunn's go-ahead single with one out in the ninth inning gave the 19th-ranked Oregon State baseball team a 6-5 victory over fifth-ranked Arizona on Friday in the their series opener at Goss Stadium.

The Beavers' Tyler Smith opened the ninth by reaching on an error on an infield fly that was mishandled by Arizona first baseman Robert Refsnyder. Smith then stole second on a Michael Conforto strikeout.

Dylan Davis was intentionally walked in order to have Arizona reliever Matthew Troupe face Dunn, who took a 3-1 pitch and found a spot in the left-center gap for the decisive hit.

The win sent the Beavers to a 15-5 record and 4-0 mark in Pac-12 play, the best start to league for OSU since the 2005 club went 5-0.

Ben Wetzler started for the Beavers against Arizona (16-7, 2-2 Pac-12), which scored four runs over its last two innings to tie the game at five.

The left-hander worked 62/3 innings, scattering four hits and a run with seven strikeouts. He also lowered his earned run average from 4.06 to 3.58.

Dunn's game-winning single was his third hit and second RBI of the game. He was joined offensively by Smith and Ryan Barnes, who had two hits apiece.

No. 24 Ducks 3, Utah 1

At Eugene, Oregon's Alex Keudell pitched seven strong innings and Aaron Jones delivered a key RBI triple to lead No. 24 Oregon past Utah in the Ducks' Pac-12 opener at PK Park.

Trailing 1-0 in the fifth, Jones lined a one-out triple to the gap in left-center field, bringing home J.J. Altobelli with the tying run. Ryon Healy followed with an RBI groundout to third, plating Jones with what proved to be the game-winning run.

After allowing a leadoff home run to Utah's James Brooks in the first, Keudell (2-3) scattered four hits and one walk the rest of the way to go with five strikeouts.