Mason Barnett highlights

Mason Barnett fans Dane Myers

Mason Barnett strikes out the side in 2nd

Mason Barnett fans Eugenio Suárez, Dane Myers and Héctor Rodríguez to strike out the side in the bottom of the 2nd

A's execute double play after ABS challenge

The Athletics execute a strike 'em out, throw 'em out double play after an ABS challenge to end the bottom of the 1st

Mason Barnett's six strikeouts

Mason Barnett allows three runs on four hits and strikes out six over five innings of work against the Red Sox

Ball 1 is overturned after ABS challenge

Mason Barnett strikes out Ceddanne Rafaela

Mason Barnett forces a lineout to seal 9-6 win

Mason Barnett secures Athletics' 11-2 win

Mason Barnett gets Brandon Lowe to pop one up to left field to secure the Athletics' 11-2 win against the Pirates

Alika Williams makes the catch for the A's win

Alika Williams makes the catch at shortstop for the final out in the A's 7-5 win against the Brewers

Mason Barnett fans Jonathan India

Mason Barnett strikes out Jonathan India in the top of the 2nd

Mason Barnett tallies his first strikeout of the game

Mason Barnett strikes out Ceddanne Rafaela swinging on a fastball to end the second inning

Mason Barnett K's Trevor Story to keep game scoreless

Mason Barnett strikes out Trevor Story swinging to end the top of the 1st inning, keeping the game scoreless

Mason Barnett fans eight batters in first career win

Mason Barnett strikes out eight batters over five solid innings of work on the mound in his first Major League win

Mason Barnett strikes out Mike Trout

Mason Barnett fans Mike Trout for the first out of the bottom of the 5th and the eighth strikeout of his start

Mason Barnett strikes out the side

Mason Barnett fans Bryce Teodosio, Zach Neto and Mike Trout in order to retire the side in the bottom of the 2nd

Mason Barnett makes Major League debut

Mason Barnett tosses four innings of work on the mound during his MLB debut for the Athletics

Mason Barnett's first Major League strikeout

Mason Barnett records his first Major League strikeout during the top of the 4th during his debut on the mound for the Athletics

Mason Barnett's nine strikeouts

Athletics No. 9 prospect Mason Barnett strikes out nine in a strong start for Triple-A Las Vegas

Mason Barnett strikes out eight

A's No. 10 prospect Mason Barnett racks up eight strikeouts over 4 1/3 innings for Triple-A Las Vegas

Mason Barnett K's seven

Athletics No. 4 prospect Mason Barnett strikes out seven batters across five solid innings for Triple-A Las Vegas

Mason Barnett strikes out eight over five innings

Athletics No. 4 prospect Mason Barnett strikes out eight over five strong innings for Triple-A Las Vegas

Mason Barnett's eight strikeouts

Athletics No. 3 prospect Mason Barnett racks up eight strikeouts in five innings of one-run ball for Triple-A Las Vegas

Mason Barnett's eight strikeouts

A's No. 6 prospect Mason Barnett strikes out eight batters in five innings for Double-A Midland in the Texas League Finals

Mason Barnett K's seven

Athletics No. 6 prospect Mason Barnett strikes out his seventh batter in a scoreless six-inning start for Double-A Midland

Mason Barnett K's nine

A's No. 6 prospect Mason Barnett polishes off seven scoreless frames with his nineth strikeout for Double-A Midland

Mason Barnett's 9th K

A's No. 6 prospect Mason Barnett polishes off six frames of one-run ball with his ninth K for Double-A Midland

Mason Barnett's ninth strikeout of the game

A's No. 6 prospect Mason Barnett gets his ninth strikeout of a quality start for Double-A Midland

Mason Barnett strikes out 10

Athletics No. 6 prospect Mason Barnett ties his career high with his 10th strikeout over seven scoreless innings for Double-A Midland

Mason Barnett strikes out eight over six scoreless

Royals No. 4 prospect Mason Barnett strikes out eight over six scoreless innings for Double-A Northwest Arkansas