CORVALLIS — Jared Norris and Brian Stamps both hit home runs as No. 2 Oregon State defeated USC, 7-2, Friday at Goss Stadium.

CORVALLIS — Jared Norris and Brian Stamps both hit home runs as No. 2 Oregon State defeated USC, 7-2, Friday at Goss Stadium.

The offensive support was perfect for Oregon State (38-12, 17-5 Pac-10) starter Sam Gaviglio, who improved to 11-1 this season after going 62/3 innings, finishing with his 10th quality start in 14 appearances this season. He allowed solo runs in both the second and third innings and had six strikeouts and gave up four hits.

The win was the 24th in Gaviglio's career, placing the Ashland native in a tie for ninth in school history with Mike Stutes (2006-08) and Andrew Checketts (1996-98). His 11 wins this season are also tied for sixth best in Oregon State single-season history.

Norris finished the night 3-for-3 with two runs, two runs driven in and a stolen base. He homered in the second, tripled in the third and singled in the fifth before walking in the seventh. He finished the game a double shy of a cycle.

Stamps had just one of the Beavers' nine hits on the night, but made it count. He hit the third pitch he saw from reliever Chris Mezger over the left-field fence in the seventh for a three-run home run, driving in Norris and Tyler Smith.

Stamps' home run gave the Beavers cushion as they held a 4-2 lead at the time but hadn't scored since the fourth inning.

USC (20-29, 10-12) took a 1-0 lead in the second on an infield single by James Roberts, but Norris' home run tied it in the bottom half of the inning.

The Trojans scored again in the third on a sacrifice fly by Ricky Oropesa in the third, but again, OSU answered back and took the lead for good with two runs. Carter Bell doubled down the left field line, scoring Kavin Keyes, for the first run of the inning, then scored himself when Norris tripled to left center.

The Beavers took a 4-2 lead in the third when Keyes doubled down the left field line, scoring Ryan Dunn from first.

Keyes extended his hit streak to seven games by going 2-for-4. Dunn also had two hits in the win.

The win kept the Beavers two games ahead of Arizona State for first place in the Pac-10.

Oregon State and USC continue their three-game series today at Goss Stadium. First pitch is set for 2:03 p.m.

WASHINGTON STATE 12, OREGON 6 — At Pullman, Wash., Oregon's early five-run lead wouldn't stand up as Washington State staged a comeback to take the first game of the series.

Washington State (23-25, 7-15) scored five runs in the bottom of the fifth to complete its comeback, as the Cougars batted around in the inning before Kellen Moen came on in relief to retire Tommy Richards.

In the bottom of the eighth, the Cougars added four more runs as Oregon surrendered a season-high 12 on the evening.

Oregon (28-25-1, 7-15) ace Tyler Anderson (7-3) took the loss after allowing eight runs on eight hits and three walks, tossing just 42/3 innings — his shortest outing of the season.