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8/8/2014 11:03 P.M. ET

Rodriguez fans season-high nine batters

Left-hander Eduardo Rodriguez, the Red Sox's No. 10 prospect, struck out a season-high nine batters in six scoreless innings Friday, but Double-A Portland lost, 5-1, at Richmond.

Rodriguez was making his second start since Boston acquired him from Baltimore in exchange for Andrew Miller at the non-waiver Trade Deadline. Rodriguez won his first start as a member of the Red Sox's organization and was in line for another victory until Richmond scored four runs in the seventh inning off reliever Wilfredo Boscan.

While Rodriguez was in the game, however, the Flying Squirrels couldn't muster much offense. The 21-year old held them to three hits and three walks. He threw 100 pitches and struck out three of the last four batters he faced.

Before the trade, Rodriguez had spent the season with Double-A Bowie. He made 16 starts for the Baysox, going 3-7 with a 4.79 ERA. He struck out 69 batters and walked 29 in in 82 2/3 innings.

Portland's lone run Friday came when third baseman Michael Almanzar hit a solo home run in the fifth inning. Almanzar, like Rodriguez, began the season in the Orioles' organization after he was selected in the Rule 5 Draft last December. He was returned to the Red Sox on July 1.

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.