It never happened between Magic Johnson's Lakers and Larry Bird's Celtics. Same for Michael Jordan and Karl Malone or Jerry West and Bill Russell.
While there have been 14 rematches in NBA Finals history, this year's meeting between LeBron James' Cleveland Cavaliers and Stephen Curry's Golden State Warriors will be the first trilogy in league history.
After the Warriors beat the Cavs for their first title in 40 years in 2015, Cleveland got revenge last season with a comeback from 3-1 down to give the city its first major championship since 1964. Now they meet for the rubber match starting June 1 in Oakland.