[4][5] He was considered one of the top prospects for the 2018 Major League Baseball draft,[6][7] but was not selected until the 38th round by the Colorado Rockies,[8] falling due to signability concerns.

[9] On June 8, 2019, Rocker became the first pitcher ever to throw a no-hitter in the Super Regional round during the NCAA Division I baseball tournament.

[10] Rocker was named the 2019 College World Series Most Outstanding Player after Vanderbilt captured the 2019 NCAA Division I Baseball Championship on June 26, 2019.

[12] Rocker had not participated in a program that would have made his medical information available pre-draft; this allowed the Mets not to make him an offer and receive a compensatory selection in the 2022 MLB draft.

[16] Prior to the draft, Rocker had a 1.35 ERA with 32 strikeouts and four walks in 20 innings pitched for Tri-City, reaching 99 miles per hour (159 km/h) with his fastball.

[25] On September 12, 2024, the Rangers' selected Rocker's contract and promoted him for his major league debut that night against the Seattle Mariners.

His parents met when his mother, Lalitha, was a student at the University of Maryland and his father was playing for the Washington Redskins.