The Portland Pilots nearly won their three-game series at defending national champ UCLA, but the Bruins prevailed in the rubber game 4-3 in 11 innings.
Oregon State cruised for the second day in a row in Tempe, Ariz., clubbing University of the Pacific 14-6.
Oregon squeaked out a win for the third time in three days at Honolulu. The Ducks were down run runs in the ninth but won 6-5 in 10 innings.
Concordia split its final two games at the Cavalier Classic, beating Collge of Idaho 7-3 and losing 16-8 to George Fox at Porter Park.
Lewis & Clark opened its season with losses to Willamette 5-4 and 7-2 at Wilsonville High.
No. 12 Bruins survive UP
UCLA won the game 4-3 and the series 2-1 with an RBI double in the bottom of the 11th at Los Angeles.
Portland had tied Sunday's game with two runs in the seventh. With two outs, Grant Taylor drew a walk, then scored on Bo Cornish's double. Chet Thompson followed with the tying RBI single.
UP freshman Austin Kelly from Clackamas High worked two innings, giving up one hit and no runs, with one strikeout.
Portland's fifth pitcher, Colin Feldtman (0-1) took the loss, after also tossing two innings.
The Pilots return to California next weekend to play in a Saint Mary'a tournament. UP's first game is 10 a.m. Thursday against Kansas State.
Beavers, Conforto start fast
Oregon State led 8-1 after four innings in beating the Pacific Tigers 14-6 at Arizona State, a win that raised the Beavers to 3-0.
Michael Conforto led OSU with five RBIs, and Dylan Davis drove in three runs.
Conforto, with 131 career RBIs, needs five more to tie Darwin Barney (2005-07) for sixth place on the all-time list at Oregon State.
Scott Schultz earned the win, giving up two runs on six hits in seven innings of his fourth career start.
OSU's final game of the trip is 10 a.m. Monday, also against Pacific (1-2).
The Beavers can go to 4-0 for the first time since 2008.
Hawaii errors help Ducks
Oregon (3-0) rallied with two runs in the top of the ninth, then won 6-5 over Hawaii in the 10th.
The four-game series concludes Monday with a 3 p.m. PT game. A victory would give UO coach George Horton 900 in his collegiate career.
On Sunday, Oregon starter Matt Krook, a 2014 MLB first-round draft pick, gave up two unearned runs in seven innings, with eight strikeouts and two walks. Oregon led 3-2 when he left the game.
Trailing 5-3 in the ninth, the Ducks got three straight pinch hits from Conoor Hoffman (single), A.J. Balta (RBI double) and J.B. Bryant (RBI single).
In the 10th, Oregon's first three batters reached base to load the bases. Aaron Payne was hit by a pitch, Tuyler Baumgartner walked and Mitchell Tolman got aboard when Hawaii pitcher Jordan DuPonte threw away a sacrifice bunt.
Then, with two outs, Baumgartner scored the go-ahead run on a throwing error by shortstop Austin Wobrock.
Jake Reed earned the win, allowing one hit over the final 2 1/3 innings.
Cavs go win, loss
Concordia scored four runs in the first inning and beat College of Idaho 7-3 at home.
Later, in the finale of the weekend Cavalier Classic, the Cavs fell 16-8 to George Fox, which outhit the hostts 19-11
Concordia is 3-2 going into a Friday-Sunday tournament, the Cascade Collegiate Conference-Northwest Conference Challege, also at Porter Park.
Pioneers fall twice
Lewis & Clark is 0-2 after losses to Willamette at Wilsonville High. The Bearcats won 5-4 and 7-2.
Michael Kinkenon and Bradley Lezak each had two hits in the opener for L&C, and Ben Beck had two hits in the nightcap.