SEATTLE — Sean Mannion's career day against Washington State on Saturday was far more impressive than his previous career-high passing day against Arizona State three weeks ago.

SEATTLE — Sean Mannion's career day against Washington State on Saturday was far more impressive than his previous career-high passing day against Arizona State three weeks ago.

Less taxing, too.

Mannion, the Beavers' freshman quarterback, threw for 376 yards and four touchdowns to lead the Beavers in a 44-21 romp over Washington State on Saturday night at CenturyLink Field.

The yardage total is the highest of Mannion's young career, and he didn't even need 66 attempts to achieve it. That's how many times he threw the ball earlier this year against ASU, when the freshman threw for 348 yards in a 35-20 Beavers loss.

This was better — 26 completions on 34 attempts — and more balanced.

Mannion was aided on Saturday by a fellow freshman, running back Malcolm Agnew, who rushed for 103 yards on 23 carries — 81 on 16 in the first half — in his second game back from a hamstring injury suffered in the team's season-opener.

All-told, Oregon State (2-5, 2-2 Pac-12) outgained the Cougars 551-315.

Even the interception Mannion threw was a near-perfect pass. With the ball at WSU's 31-yard line late in the first quarter, Mannion lobbed an on-target toss toward Markus Wheaton in the back left corner of the end zone.

It appeared as if the pass would land right in Wheaton's hands to give OSU a 14-0 lead. But the ball was wrestled away by Cougars safety Damante Horton, and the officials signaled for a touchback instead of a touchdown.

Despite the not-so-fortuitous bounce, Mannion still finished the first half with 178 passing yards and two touchdowns — on just eight completions.

Oh, and it's highly unlikely that anybody on the Cougars (3-4, 1-3 Pac-12) sideline knows the name of Oregon State's punter, Johnny Hekker. That's because the Beavers offense kept him on the sideline until just one minute remained in the game, punting only after a garbage-time three-and-out with the game already well in hand.

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MANNION'S FIRST-HALF interception looked at first as if it might be a turning point for the Cougars, who responded to Oregon State's first two scores with touchdowns of their own.

But once the Beavers defense started battering WSU quarterback Jeff Tuel, it was all OSU.

Tuel took a couple of vicious hits on the Cougars' final possession of the first half, and WSU went with backup quarterback Marshall Lobbestael for the entire second half. There was no explanation provided about any injury Tuel may have suffered, though he was seen jogging slowly out of the tunnel with WSU trainers just before kickoff of the second half.

OSU took full advantage of his absence. Lobbestael was able to lead just one scoring drive, capped by a 2-yard touchdown run by Carl Winston that cut the OSU lead to 34-21 with 11 minutes left in the game.

WSU never threatened to score after that.

Tuel completed 11 of 13 passes in the first half for 127 yards, but the Beavers sacked him three times — one by Scott Crichton, one by Andrew Seumalo and one by Taylor Henry — and hit him on numerous other occasions.

Running the ball against the Beavers didn't work, either. WSU managed just 83 yards on 29 attempts and looked lifeless without Tuel. Oregon State limited the Cougars to 122 total yards in the second half.

Lobbestael finished 10-for-20 passing for 105 yards and a late interception to Beavers safety Rashaad Reynolds in the end zone.

It was an about-face from last season's game between these two teams, when the Cougars snapped a 16-game conference losing streak with a 31-14 beating of the Beavers at Reser Stadium.

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FRESHMAN DEFENSIVE END Dylan Wynn always seems to be around the football.

So much so, in fact, that he broke an Oregon State single-season record on Saturday with his fourth and fifth fumble recoveries of the season.

And he got an assist on the record-setter from another record-tying Beaver defender.

When fellow defensive end Crichton blindsided Tuel for a sack late in the first half, he knocked the ball loose, too — which also happened to be his fourth forced fumble of the season, tying the Oregon State single-season record in that category.

Wynn came up with the recovery for his fifth of the season, and a new record to boot.