Stroman has done a remarkable job keeping the ball in the park. He's yet to allow a home run in 41 innings and has the second-best ground-ball rate (54.9 percent) in the AL. He also owns the second-lowest ERA and sits third in WAR among AL starters.

It's been a breakout year early on for Boyd, who leads AL starters in WAR. The left-hander has tossed at least six innings in all but one of his starts and has allowed no more than three runs in any of them. 

After struggling with consistency in Pittsburgh, Glasnow looks as though he's finally put it all together with the Rays. The 6-foot-8 right-hander ranks first in ERA and third in BB/9, walking just seven batters in 36 innings.

Injuries cost Bauer a shot at a Cy Young last season, but the right-hander is off to another strong start. Bauer ranks in the top five in the AL in innings pitched, ERA, strikeouts, and opponent batting average. 

It's remarkable how consistent Verlander remains into his age-36 season. The 2011 Cy Young winner - and three-time runner-up - ranks fourth in the AL in innings pitched and third in WHIP, strikeouts, and opponent batting average.