During his 25-year pro coaching career Fitch repeatedly was hired in an attempt to improve failing teams. As of 2004 Fitch ranked fifth among all NBA coaches in all-time number of victories (with 944) but also ranked second in all-time losses (with 1,106) behind Lenny Wilkens.
With Boston Celtics (1980–83), and Houston Rockets (1984–88)
The Miracle of Richfield Cavs' season (1975–76)
During his first year with the Cavaliers, the team lost its first 15 games. By the 1974–75 season the team would be led by its 1971 number one draft choice out of Notre Dame, Austin Carr. Carr had become the team's leading scorer and the franchise was flirting with its first-ever playoff berth when Carr came down with a serious knee injury, which all but vanquished its playoff hopes and its hopes for its first non-losing season, however, the team did still show promise posting a near-winning finish at 40–42.
The very next season, on a now fabled team known as "The Miracle of Richfield", and led by team captain Carr, scoring small forward Campy Russell, shooting guard Bobby "Bingo" Smith, and a supporting cast of largely unknown players such as starting center Jim Chones, and an aging Nate Thurmond, Fitch coached the overachieving Cavs to its first winning season, an almost unexpected playoff berth and the Central Division title with a record of 49–33, advancing to the Eastern Conference Finals against a heavily favored Boston Celtics team led by future Hall of Famers Dave Cowens, small forward John Havlicek, and All-Star point guard Jo Jo White. Perhaps because of a leg injury that sidelined Chones in Game 5, the Cavs would succumb to the eventual champion Celts, losing the series 4–2.