TUCSON -- University of Oregon right-hander Justin LaTempa kept Arizona's potent lineup in check for most of the night, but an offensive onslaught in the late innings propelled the Wildcats to an 8-4 victory, their second in as many nights against the Ducks to open Pac-10 play.

Steve Selsky went 4 for 5 with a home run and three RBI and Bryce Bandilla (3-1) earned the win on the mound, allowing two runs - one earned - on five hits over 6 1/3 for an Arizona team that has won 15 straight overall.

LaTempa (2-2) went 6 2/3, allowing four runs on nine hits. He walked only one and struck out eight.

The Wildcats (20-4, 2-0 Pac-10) actually trailed 2-1 going into the last half of the sixth, but scored seven times in their final three at bats.

Seth Mejias-Brean was 3 for 4 and Joey Rickard, Bobby Brown and Alex Mejia had two hits apiece for the home side.

Danny Pulfer led the Ducks (17-8, 0-2) at the plate, going 2 for 4 with a pair of doubles. J.J. Altobelli was 1 for 3 with two RBI.

The Ducks took their first lead of the series in the second. Eddie Rodriguez led off with a walk, advanced to second on a base hit by Shawn Peterson, and both runners moved up after Paul Eshleman sacrificed. Altobelli promptly brought home Rodriguez with a sacrifice fly for a 1-0 edge.

After a solo homer by Selsky tied the game in the fourth, Oregon took advantage of an Arizona miscue in the top of the fifth to reclaim the lead, 2-1. KC Serna singled with two outs to plate Andrew Mendenhall, who had reached on a throwing error by third baseman Mejias-Brown.

Arizona went on top in the sixth thanks to a two-out, two-run single from Mejia. With runners on first and third and one out, LaTempa struck out Mejias-Brean but allowed Brown to steal second base and move into scoring position. That play proved key as Brown scored the go-ahead run on Mejia's soft liner to right.

Oregon had the bases loaded with one out in the seventh, but Pulfer lined into a double play keyed by a nice leaping grab by second baseman Bryce Ortega.

The Wildcats then proceeded to break it open in their half of the seventh, scoring four runs and roughing up UO reliever Scott McGough, who allowed four hits and a walk without recording an out . All four runs came with two outs with Brown delivering the biggest blow on a two-run double down the right field line.

The Ducks took advantage of some sloppy fielding by UA, scoring two in the eighth, but left the bases loaded.

Oregon was out-hit 14 to 7, but had ample opportunities to score, leaving 11 runners on base.

The Ducks will attempt to salvage a win in the series finale on Sunday. First pitch is scheduled for 12 p.m.