What could he do with a Louisville Slugger?
Some pitcher from the 70s or 80s told a story about George Brett. I think it was Scottie McGregor but I'm not sure. Anyway, he was golfing with George Brett. Brett had already teed off and had moved the golf cart down the fairway. Someone hit a tee shot down the fairway and yelled to warn Brett who grabbed a golf club. Brett ran and got into position and took a baseball swing at the golf ball before it landed and lined it halfway back to the tee box. The pitcher concluded the story but asking 'how am I supposed to throw a baseball by this guy?'
In response to your question and based on this story, I'm guessing with some practice could do quite well.