In the span of nine days, the Stony Brook men's lacrosse team went from the joy of pulling off an upset to the frustration of being a victim of one.

On April 4, the then-unranked Seawolves stunned No. 12 Princeton. On Sunday, as the 18th-ranked Division I school, they were toppled by Lehigh, 12-11, in a non-league game at LaValle Stadium, snapping their winning streak at five.

"We were on a hot streak,'' said defenseman Lucas Rock, whose second collegiate goal brought Stony Brook (10-3) within one with 1:25 left. "This loss brought us down a little bit.''

Added coach Jim Nagle: "Sometimes you get a little inflated and think that you're better than you are and you forget why you got there was because you've been playing together.''

The Seawolves stumbled to a 7-3 halftime deficit as Reid Weber (four goals) and Dan Taylor each scored twice for Lehigh.

"We thought it was going to be a little easier than what it was,'' said attack Mike Rooney, who scored three goals. "They were pretty disciplined on defense. We didn't really stick to our fundamentals.''

The Seawolves struck for five unanswered goals by Jay Lindsay, Chris Hughes, Jake Sheets, Alex Corpolongo and Rooney in the opening 6:63 of the third. They grabbed an 8-7 advantage on Rooney's man-up score, which tied Kevin Crowley (2010) for most points (77) in a Division I Stony Brook season.

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After Lehigh (6-8) scored twice in 55 seconds, Rooney's goal with 12 seconds left in the third tied it at 9.

Lehigh's Kurtis Kaunas made it 10-9 at 12:14 of the fourth.

Brody Eastwood's 51st goal tied Crowley's school record for most in a season.

"He's an off-ball player, so he seizes his opportunities,'' Nagle said of Eastwood. "Some games he's going to get a ton of opportunities, other games he's not going to. I think he would have liked to have had a few of those back. He missed a couple of easy ones he typically doesn't miss.''

When the Seawolves host No. 7 Duke, the defending Division I champion, on Wednesday night, they will be back in the underdog role.