Duran was 2 for 3 with two walks and Isiah Kiner-Falefa went 3 for 3 with a stroll. Ceddanne Rafaela and Wilyer Abreu had two hits apiece.
Caleb Durbin’s single scored Carlos Narváez to offer Boston a 2-1 lead within the second.
Garrett Whitlock (3-1) pitched a 1-2-3 eighth. Starter Ranger Suarez gave up one run and 4 hits and walked three in 4 1/3 innings.
Bailey Falter (0-1) gave up two runs and 4 hits, walked three and struck out two in two innings.
Lane Thomas went 2 for 4 with an RBI double for the Royals and Carter Jensen additionally doubled.
Contreras singled to drive in Duran within the first inning.
Bobby Witt Jr. singled, stole second and scored when Thomas doubled with two out to make it 1-1 in backside of the primary.
Duran hit a three-run shot and Contreras singled to drive in Rafaela to cap the scoring within the ninth.
Crimson Sox LHP Connelly Early (3-2, 3.21 ERA) begins Wednesday in opposition to RHP Michael Wacha (4-2, 2.83) within the finale of a three-game collection.
