De Brun attended
Summit High School in
Bend, Oregon. In Summer 2024, he played with USA Baseball's 18U National Team. As a senior in 2025, he led Summit to the state championship and hit .370 with 26
runs batted in (RBI) and 22
stolen bases. De Brun was considered a top prospect for the
2025 Major League Baseball draft. He was committed to play
college baseball at
Vanderbilt University. ==Professional career==