The Royals have acquired RHP Nathan Karns from the Seattle Mariners in exchange for OF Jarrod Dyson.
Karns, 29, spent 2016 with the Mariners, going 6–2 with a 5.15 ERA (54 ER in 94.1 IP), including a 5–1 record with a 3.43 ERA (22 ER in 57.2 IP) through his first 10 starts. That stretch included a career-best five-game winning streak from April 15 to May 30. He recorded 9.64 SO/9 before the All-Star break, which ranked sixth in the American League (min. 85.0 IP).
He missed the last two months of the season after being placed on the 15-day DL with a lower back strain on July 30.