Ex-MLB pitcher Tyrell Jenkins -- a 1st round draft pick in 2010 -- threw crazy haymakers in a huge brawl during a softball game in Texas this week ... and TMZ Sports has the video.
27-year-old Jenkins was a high school superstar who was recruited to play baseball and football at Baylor ... but signed a $1.3 mil contract with the STL Cardinals instead.
He made his MLB debut in 2016 for the Braves ... and kicked around with a few teams before moving back home to coach youth baseball. He's now heavily involved in adult softball.