Frederick Keys left fielder Roberto Rivera said he hasn't been focusing on any one pitch during his recent torrid streak at the plate and he wasn't tonight in the Keys' 6-3 win over the Potomac Cannons.

Said Rivera: "I just like to see the ball and hit it hard."

The former undrafted free agent went 3 for 4 with a home run and three RBI to go along with a 4-for-4 night by teammate Luis Matos as the Keys won their Class A Carolina League game before 4,639 at Harry Grove Stadium.

Rivera is 11 for 22 over his past six games to raise his average from .267 to .290, helping the Keys (33-32) win four straight to push them above the .500 mark for the first time since May 28.

"I'm seeing the ball very good, a lot better than I was," said Rivera.

Frederick starter Chad Paronto (1-3), who had a 10.81 ERA over his previous three starts, looked sharp early before allowing three runs on eight hits and striking out six in six innings to earn his first win since being demoted from Class AA Bowie on May 20.

Potomac took a 1-0 lead in the fourth inning on consecutive singles by Andy Bevins, David Kim and Billy Deck.

The Keys tied it in the bottom of the fourth on Rivera's leadoff homer, then took a 4-1 lead in the fifth on Eddy Garabito's RBI single and Roberto Rivera's two-run double.