ATLANTA- Senior Ben Marshall had a career day on the mound Saturday with a one-hit, complete game shutout, getting just one run of support but pitching the Georgia State baseball team to a 1-0 win over William & Mary to clinch the Colonial Athletic Association series.

Marshall's second complete game in three weeks powered the Panthers to their first 1-0 win since 2010 and second shutout of the year.

Greg Bowder's fifth-inning RBI single scored Joel Van Asch for the only run the Panthers would need on the day.

GSU moved to 7-7 in the CAA and 16-20 overall with the victory, moving past William & Mary in the conference standings by dropping the Tribe to 8-9 in the league and 23-15 overall.

Marshall (4-3) struck out six batters on 118 pitches, outdueling Tribe starter Brett Koehler (4-1), who took his first loss of the year despite going eight innings with four strikeouts and yielding six hits.

The Panthers have now won all three CAA home series this year and are 14-7 at the GSU Baseball Complex this season.

"This was one of the greatest pitching performances since I've been here," said head coach Greg Frady, in his eighth year with the GSU program. "Ben worked ahead in the count and his rhythm and pace were fantastic. As a senior, he knows what's at stake. This is a huge series for us."

"Winning a game like this for your team is amazing," said Marshall. "I had a lot of pitches working for me today. The wind was helping me out a lot, holding a lot of balls up that (William & Mary) hit in the air and my defense was great today."

GSU did not commit an error in the field.

The game remained scoreless into the fifth inning as both pitchers got off to a great start.

William & Mary's lone hit against Marshall came in the third inning, when Chris Forsten bounced one back through the middle that found its way into shallow center field. Forsten, like the Tribe's four other baserunners on the day, would be stranded by Marshall.

GSU's bottom three hitters in the order then broke through for game's only run. Joel Van Asch led off the fifth with a single, was moved over on a sacrifice by Scott Sarratt, and was scored on a single into right field by Greg Bowder.

Van Asch finished with two hits on the day, as did Drew Shields. Brandon Williams added GSU's only other hit off Koehler.

Marshall lowered his ERA Saturday to 2.83 for the season. He's now thrown a team-leading 60.1 innings thus far and picked up the first four victories of his career after appearing in 36 games over his first three seasons without a win.

The Loganville, Ga., native tossed a seven-inning complete game shutout Opening Day this year then fired his first nine-inning complete game two weeks ago in a win at George Mason.

The Panthers will try for the series sweep over the Tribe Sunday afternoon at 1 p.m. at the GSU Baseball Complex.