Forsythe hit .223 with six home runs and 26 RBIs in 110 games in 2014, his first season with the Rays.
"I think Logan's had a good spring," Cash said. "Logan's a good defender. Plays second base really well.
"I think we're all very happy about the way his spring has gone. Him and [Rays hitting coach Derek Shelton] have had a lot of discussions on some adjustments and they seem to have paid off. He's barreled a lot of balls this spring."
Forsythe is also considered the team's backup first baseman, which explained his remaining behind in Port Charlotte, Fla., on Wednesday to play six innings in a Minor League game.
Cash said Forsythe will play one additional game at first before focusing strictly on second base. The plan is to have him work with the regular infield of Evan Longoria, Asdrubal Cabrera and James Loney.
Forsythe got off to a slow start in 2014 when he hit .167 in April and .235 in May before rebounding to hit .315 in June while getting more consistent playing time.
"I think it helps for a hitter to get consistent playing time," Cash said. "That's a huge thing for a hitting. The timing and staying on time."
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.