Last season, Bruce hit .210 against southpaws with two home runs and 14 RBIs.
"He's been much better," manager Dusty Baker said. "We try to give him some theories and philosophies. He's talked to a lot of left-handed hitters. I tried to have him talk to as many left-handed hitters that can hit lefties, people like Luis Gonzalez, Raul Ibanez and get a theory and a philosophy on how to hit lefties. Where to aim and how to stay in there and recognize the pitch as early as possible. It's a process, but he's getting better and the only way to get better is to let him face them."