HANOVER, N.H. — Dartmouth scored four times in the first inning, taking advantage of a dropped fly in deep left-center, then stymied visiting Quinnipiac on Tuesday afternoon at Red Rolfe Field at Biondi Park in a 5-3 victory, The Big Green (18-15) won their ninth straight game and remained perfect against non-conference opponents (18-0) on their home field since it was renovated before the 2009 season. Quinnipiac fell to 6-33 on the season.

Sophomore Louis Concato (3-1) allowed just one unearned run in his six-inning start, surrendering five hits and a walk while fanning four. The newly named Ivy League Rookie of the Week, freshman Thomas Olson, picked up his fifth save of the year with two scoreless stanzas.

The Bobcats were the first strike in the game, thanks to Gabe Guerino’s two-out RBI single through the hole on the right side of the infield. An error had extended the inning, making the run unearned for Concato.

In the bottom half, Dartmouth jumped on Quinnipiac starter Matthew Lorenzetti (0-2). Senior Joe Sclafani led off with a single and went to third when freshman Thomas Roulis doubled just over the head of the left fielder. After junior Chris O’Dowd drew a walk to load the bases, sophomore Dustin Selzer sent a deep drive to left-center. The center fielder covered the ground, but then failed to squeeze the ball in his glove for a two-base error. Selzer was credited with a sacrifice fly and an RBI as two runs crossed the plate. One out later, junior Ennis Coble chopped a ball to second to plate O’Dowd, and freshman Matt Robinson followed with an RBI single for a 4-1 Big Green lead.

The next five frames were largely uneventful as both pitchers settled down. Only one base runner advanced to second base in those innings when Quinnipiac put runners on first and second with nobody out in the fifth. But Concato bore down and retired the next three hitters to wriggle out of the jam.

Quinnipiac loaded the bases in the seventh against senior reliever Max Langford thanks to a pair of walks and an error, only to have the right-hander get the third out on a checked-swing third strike.

Dartmouth tacked on an insurance run in its half of the seventh. Roulis walked for the second of three times in the game, but was erased on a force play that put O’Dowd on first. The swift catcher swiped his sixth base of the season, then scored when Selzer dumped a looping liner into right-center, giving the Green a 5-1 lead.

Langford wasn’t as fortunate in the eighth, loading the bases once again, this time with nobody out, on an infield hit and two more free passes. Dartmouth Head Coach Bob Whalen called Olson from the bullpen, who got the first out on a force at second, allowing a run to come home. Forrest Dwyer followed with an RBI single, his second hit of the game, to cut the deficit to two runs at 5-3, before Olson got the final two outs — one on a fantastic sliding catch by sophomore Jeff Keller down the right-field line — to subdue the uprising.

In the ninth, Olson quickly retired the side on a fly ball to each outfielder to close out the win.

Robinson and senior Jake Carlson each had two hits for the Big Green, Selzer drove in two of the five runs and O’Dowd scored twice.

Lorenzetti (0-2) took the loss, allowing four runs, one earned, on five hits and three walks over five innings, striking out one. Dwyer had two of the seven hits for the Bobcat offense while Christopher Caldari reached base three times on a single and a couple of walks.

Dartmouth will attempt to extend its winning streak into double digits when it plays at Boston College tomorrow afternoon at 3 p.m. Quinnipiac will play a four-game NEC series this weekend at Sacred Heart beginning on Friday with a single game at 3 p.m.