Krol's role figures to be highly specialized, considering right-handed hitters roughed him up during his rookie year last season. He held lefties to a .220 batting average, but righties hit .304 against him with an OPS of .957.
On Friday, he retired two righties -- Steve Pearce and Adam Jones -- before getting lefty slugger Chris Davis to fly out to left on an 0-2 count.
Krol had family in from the Chicago suburbs to watch his first game as a Tiger. He said that pitching with a power-packed lineup to support him is not entirely different than his season in the Nationals' bullpen.
"It's unbelievable to go from guys like Jayson Werth and [Bryce] Harper to another club with guys like Miggy [Cabrera] and Torii [Hunter]," he said.
Chris Vannini is a contributor to MLB.com. Matt Slovin is an associate reporter for MLB.com.