The Mixed Teams championship is one of the oldest ACBL events, first played in 1929.
At one time it was restricted to players with at least 100 masterpoints (thus the name to 1995, "Master Mixed Teams") but now is an open event.
From 1946 to 1955, a separate event with national rating was held on the West Coast.
At least four champion Mixed Teams defended their titles successfully and without change in personnel, in 1944, 1950, 1953, and 1978.
From 1946 to 1955, a separate event with national rating was held on the West Coast.