[8] During his first year of varsity basketball at the University of North Carolina at Chapel Hill in 1955, Rosenbluth was the Tar Heels' leading scorer.

His regular season performance earned him the Helms Hall of Fame "Collegiate Player of the Year" designation over the University of Kansas's Wilt Chamberlain.

[11] The Tar Heels went on to defeat Chamberlain's Jayhawks 54–53 in triple overtime for the NCAA Basketball Championship, North Carolina's first, which brought credibility to the fledgling Atlantic Coast Conference.

Rosenbluth's scored 20 points in the championship final, was the tournament's overall top scorer at 28.0 ppg, and was named to the All-Tournament Team.

[14][15] Rosenbluth held several UNC records at the time of his death, including most points in a single season (897),[16] and highest single-season average (28.0).

[2] He made his NBA debut with the franchise on October 25, 1957,[2] playing six minutes and scoring a two-point field goal against the Syracuse Nationals.