Kluber, who won his first Cy Young Award in 2014, posted an 18-4 mark with a league-leading 2.25 ERA for the AL Central Division champions in 2017. The 31-year-old right-hander paced the AL in WHIP at 0.869 and struck out 265 batters in 203 2/3 innings over 29 starts.
Kluber is the 19th pitcher to win multiple Cy Young Awards and earned the first-place vote on 28 of the 30 ballots while being listed second on the other two ballots.
Kluber owned a 5.06 ERA after a rough start on May 2 before spending nearly a month on the disabled list. The Stetson product returned with six scoreless innings on June 1 and went 15-2 with a 1.62 ERA over his final 23 starts.
Sale (17-8, 2.90 ERA) led the majors in strikeouts with 308 and was the favorite to pick up his first Cy Young before fading down the stretch. The 28-year-old posted a 4.09 ERA in August and September and twice lost to Kluber's Indians.