The Arizona Diamondbacks are over .500 15 games into the season and a good chunk of the credit for that can be given to Archie Bradley.

Though Bradley was a little bit wild, he allowed only one run and two hits in six innings and improved to 2-0 in three starts this season. He’s faced three staff aces in Clayton Kershaw, Madison Bumgarner and Yovani Gallardo and represented well against each.

Bradley is the first pitcher in Diamondbacks history to start his career with three games of at least six innings pitched and two or fewer earned runs allowed. He has a 1.45 ERA and 0.96 WHIP in these three starts, with the Diamondbacks winning all three games.

The Diamondbacks bullpen has had its issues in his last two starts, allowing eight runs in 8 1/3 innings.

Bradley’s start concluded a highly successful turn through the rotation for Diamondbacks starters. Four of the five allowed one run or fewer, with the best start being Josh Collmenter’s shutout of the Giants.

The five starters combined to go 35 1/3 innings and allow six earned runs.

How he’s emerged

Bradley is winning with two pitches—a fastball that ranges from 91 to 94 MPH, and a curveball that usually registers in the high 70s or low 80s.

On Wednesday, it was the fastball that retired 13 hitters and yielded only two hits. Bradley did retire three hitters on the 22 curves he threw. He’s thrown 72 of them, netting 16 outs and not allowing a baserunner.

Bradley has also excelled at getting ground balls, coaxing 31 grounders and bunts on the 47 balls in play against him. His 66 percent ground-ball rate currently ranks third-highest in the majors. The Rangers went 1-for-8 on grounders and bunts against him on Wednesday, including two double plays.