Marshall Phillip "Mark" Brownson III[1] (June 17, 1975 – February 1, 2017) was an American professional baseball right-handed pitcher, who played in Major League Baseball (MLB) for the Colorado Rockies (1998–1999) and Philadelphia Phillies (2000).

Brownson made his big league debut on July 21, 1998,[2] hurling a 4-hit, complete game shutout, against the Houston Astros.

As of 2020[update], his game score of 85 is the highest by any National League debutant pitcher in the Wild Card Era.

[4] Unfortunately, he struggled throughout the remainder of his short MLB career, compiling an 8.54 earned run average (ERA) in the 10 games after his magical debut.

Brownson pitched in his 11th and final major league game on July 20, 2000,[2] just a short time after his 25th birthday.