He played three games in Major League Baseball as a right-handed relief pitcher for the 1969 and 1971 Pittsburgh Pirates.

degree in mathematics,[1] Brosseau stood 6 feet 1 inch (1.85 m) tall and weighed 180 pounds (82 kg).

In his debut game, on September 10 at Forbes Field, he replaced starting pitcher Steve Blass in the fourth inning against the St. Louis Cardinals, with the Bucs already trailing 4–0.

[2] However, in the fifth inning, he left the bases loaded with only one out before being relieved by Bruce Dal Canton, who then allowed two of Brosseau's runners to score.

[4] All told, in 3⅔ Major League innings pitched, he gave up three hits, two earned runs, and two bases on balls, with two strikeouts.