Vargas pitches Mariners over Royals, 4-1
Vargas (11-7) allowed just a fourth-inning double during his eight innings, while striking out five and walking three.
He retired the first 11 batters he faced before Billy Butler's 200th career double drove in Lorenzo Cain in the fourth. Vargas walked Cain, then fell behind 3-0 before Butler drilled a fastball to the gap in left-center.
Kansas City did not get a runner to second base against Vargas after the fourth.
Kansas City starter Luis Mendoza (4-7) threw five innings, allowed nine hits, four earned runs, walked three and hit a batter.
Tom Wilhelmsen pitched the ninth for his 12th save in 14 opportunities.