Mahle attended Westminster High School in Westminster, California. Playing for the school"s varsity baseball for his last three years of high school as a two-way player, on varsity he recorded a.372 batting average, 73 hits and 3 career home runs, while winning 13 games on the mound, recording a 1.21 earned run average and 122 career strikeouts.
Mahle was named a Louisville Slugger Freshman All-American after his 2012 collegiate season. The Angels selected him with the 449 pick in the 2014 Major League Baseball draft. High School College career As a Freshman at University of California Santa Barbara in 2012, Mahle pitched 46.1 innings recording a 3-4 record and a 3.88 earned run average.
At the plate, Mahle recorded a.347 batting average with 66 total hits, which helped him earn a spot on the Louisville Slugger Freshman All-American Team along with 2nd Team All Big West.
As a hitter, he recorded a.345 batting average while suffering only 2 strikeouts the entire season. Mahle was drafted in the 15th round with the 449th pick of the 2014 Major League Baseball First Year Player Draft.
Shortly after signing, he began his professional career with the Orem Owlz of the Rookie Pioneer League where he posted a 0.00 earned run average in 8 innings. Mahle was then promoted to the Burlington Bees which are in the Class-A(Low-A) Midwest League, where he recorded a 3.38 earned run average while allowing only 20 hits in 20 innings pitched.
Mahle"s brother Tyler Mahle, plays minor league baseball as well in the Cincinnati Reds Organization and is currently on the Billings Mustangs of the Rookie Pioneer League.
As a Sophomore in 2013, he pitched 61 innings recording a 7-5 win-loss record with 2 saves and a 4.28 earned run average, helping the University of California Santa Barbara Gauchos get to a regional for the first time since 2001. As a Junior in 2014, Mahle pitched 70 innings earning a 6-5 win–loss record with 1 save and a 2.70 earned run average.
