The hardest-throwing fastball pitchers of the 2016 season

Chapman has predictably led all of MLB with his four-seamer averaging 100.9 mph. He's been an elite closer this season between the Yankees and Cubs, with a 1.64 ERA and 36 saves.

Cabrera throws darts with his fastball and has fared well as a setup man for Atlanta. He has a 2.87 ERA in 38 appearances during his rookie season.

Estevez briefly served as Colorado's closer this season, converting 11 saves. He has a 5.09 ERA over 61 appearances.

Syndergaard has become the Mets' clear ace this season, with a 2.63 ERA over 177.2 innings. His fastball velocity has been impressive all year.

Ellington has had another dominant season, albeit in only 29.2 innings. The hard-throwing right-hander has a 1.52 ERA in 28 appearances for the Marlins.

Vizcaino has served as Atlanta's closer for much of this season when he hasn't been injured. He's converted 10 saves and has a 4.42 ERA in 43 appearances.

Betances became the Yankees' closer once they dealt Aroldis Chapman and Andrew Miller, and he's kept pace as a hard-throwing reliever. He's converted 12 saves and has a 3.00 ERA 71 appearances.

Caminero has struggled at times due to his wildness but has managed a 3.62 ERA in 56 appearances between Pittsburgh and Seattle. His velocity can be downright scary, as he doesn't always know where the ball is going.

Gustave has made only 11 appearances this season, but the Astros have a talented reliever on their hands. He's posted a 3.65 ERA with his elite velocity.

Still one of the elite closers in the game, Kimbrel has a 2.65 ERA and 30 saves in 54 appearances for the Red Sox. His velocity isn't quite what it was earlier in his career, but it still ranks among the league's best.

Eovaldi suffered a major elbow injury this season, but before that time he showed tremendous fastball velocity. He posted a 4.76 ERA in 124.2 innings for the Yankees.

A dominant minor league reliever, Glover could have a great future in the majors. He has a 5.03 ERA in 19.2 innings for the Nationals this season.

Diaz has emerged as an elite closer for Seattle in his rookie season. He has a 2.28 ERA in 47.1 innings with 81 strikeouts.

Rondon has spent time as Detroit's closer prior to this season because of his great stuff. He's posted a 2.97 ERA in 34 appearances this season.

Bush is quite a story, getting a second chance this season. Converted from shortstop to relief, he's been a key setup man for the Rangers with a 2.56 ERA in 56 appearances.

Herrera has been dominant in just about every role for the Royals this season, with a 2.43 ERA and 12 saves in 70.1 innings. 

Giles' season has been a whirlwind, joining the Astros in the offseason and failing early in the year as the closer. He's back in the role now and has a 4.22 ERA and 14 saves in 64 innings. His elite velocity has helped him produce 99 strikeouts.

Strickland has a 3.15 ERA in 70 appearances for the Giants, serving as their setup man. He also has three saves.

Ravin hasn't pitched much this season due to injuries, but he has been effective when he has pitched with eight scoreless innings. The minor league veteran shows an elite fastball.

Ramirez has pitched better since joining the Angels this season but still has a 4.40 ERA in 67 appearances between Anaheim and Cincinnati. The right-hander has struggled to keep the ball in the park despite his velocity.

Remaining effective has been a struggle for Kelly since joining the Red Sox in 2014. He has a 5.30 ERA between starting and relief in 37.1 innings this season.

Baez has been a workhorse for the Dodgers, with a 3.08 ERA in 72 appearances. He's also shown great velocity and has more than 10 strikeouts per nine innings.

An elite prospect, Reyes has been dominant for the Cardinals between starting and relief with a 1.58 ERA in 40 innings. He features a terrific fastball and curveball.

Rondon has spent most of the year at Triple-A Indianapolis working on his control, but he showed huge velocity in two appearances with the Pirates.

Chargois has struggled for Minnesota with a 5.23 ERA in 20.2 innings, but the rookie has shown elite velocity that could serve him well down the line.