Fife made three starts for the Dodgers before the team acquired Joe Blanton, and he was effective in each. He went 0-1 with a 2.16 ERA while allowing just four earned runs in 16 2/3 innings.
The 25-year-old is starting Sunday because ace Clayton Kershaw was scratched with continued right hip pain that could end his season.
The only other option for the Dodgers was John Ely, who went 14-7 with a 3.20 ERA in 27 starts in the Minors this year. However, manager Don Mattingly liked how Fife has pitched lately and decided to use him against Adam Wainwright and the Cardinals on Sunday.
"He's pitched well," Mattingly said. "The times he has pitched, he's been good. He's hung in there and changed speeds."
Mattingly said he is comfortable playing the matchups with his bullpen if Fife can hold his own like he did in three starts earlier this season.
"If he can go out and keep us in the game for five innings, I'd say we'd be happy," said Mattingly, who would go with a four-man rotation if the off-days work out and Kershaw can't return.