Senators second baseman Michael Martinez was the first base runner allowed by Baysox starting pitcher Brian Matusz on an infield single to lead off the top of the fourth inning.

Martinez, however, was quickly erased when Harrisburg left fielder Michael Daniel hit into a 4-6-3 double play. Matusz struck out Senators shortstop Ian Desmond to end the top of the fourth.

Baysox third baseman Mike Costanzo led off the bottom of the fourth with a walk. Second baseman Miguel Abreu doubled down the left field line for Bowie, and Costanzo scored on a wild pitch.

Right fielder Ambiorix Concepcion hit a sacrifice fly to left field to give the Baysox a 3-0 lead, and Bowie catcher Adam Donachie walked with one out.

After center fielder Danny Figueroa singled to put runners on first and second base for the Baysox, designated hitter Guillermo Rodriguez flied out to right field and shortstop Cesar Izturis hit a comebacker to the pitcher to end the bottom of the fourth.

Matusz mowed through the Harrisburg hitters again in the bottom of the fifth. Senators right fielder Joel Guzman flied out to right field, third baseman Ofilio Castro grounded out to shortstop and designated hitter Matt Whitney struck out looking.

Through five innings, Matusz has thrown 45 of his 58 pitches for strikes. The Baysox are holding onto a 3-0 lead heading into the bottom of the fifth.