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9/1/2014 4:43 P.M. ET

Rookie-level Red Sox win Gulf Coast League title

After splitting the first two games of the Gulf Coast League championship series, the Rookie-level Red Sox secured the title with an 8-1 victory against the Yankees in Monday's decisive third game.

The Red Sox took the lead when Michael Chavis, the club's No. 15 prospect, drove in a run on a fielder's choice in the top of the first inning. They didn't look back, pounding out 13 hits and drawing six walks in the victory.

Chavis, the 26th overall pick of the 2014 First-Year Player Draft, served as the designated hitter and finished the day 1-for-5 with a home run and three RBIs. Third baseman Rafael Devers, the Red Sox's No. 6 prospect, went 1-for-5.

The Red Sox's lineup also included newly signed Cuban outfielder Rusney Castillo, who made his organizational debut Sunday. He played center field and batted leadoff, going 0-for-3 with a walk and an RBI in five innings.

Right-hander Jake Cosart, the Red Sox's third-round pick this year, started the game and threw three scoreless innings. He struck out five, walked none and held the Yankees to one hit. Left-hander Luis Ramos allowed one run in four innings of relief to pick up the victory.

The Gulf Coast League is the first U.S.-based Minor League to award its championship. The Red Sox went 36-24 in the regular season and won the South Division before defeating the Cardinals in the semifinals to reach this weekend's championship series.

Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.