The long ball led to Jon Lester's shortest outing of the season last week.
The veteran Chicago Cubs left-hander will try to solve that issue when he starts the finale of a three-game series in Detroit on Wednesday.
Lester surrendered four homers in 3 2/3 innings against the Chicago White Sox on Friday and was tagged with his first loss in five starts.
"They have, obviously, some damaging power," Lester said afterward. "They're confident against lefties. They're swinging the bat well against them. And if you're not executing, if you're in there for 100 pitches and you're not executing 99 of them, they're going to make you pay.