Oddly, Tatum's 50 yesterday came in a game that is considered neither a playoff game nor a regular season game.
Still, it is his 3rd 50+ game in 38 days. No Celtic had done that before.
Here are all of the Celtics 50+ games, regular season or... postseason.
1T. Larry Bird, 60, 3/12/1985
1T. Jayson Tatum, 60, 4/30/2021
3. Kevin McHale, 56, 3/3/1985
4. John Havlicek, 54, 4/1/1973 (playoffs)
5T. Bird, 53, 3/30/1983
5T. Isaiah Thomas, 53, 5/2/2017 (playoffs)
5T. Tatum, 53, 4/9/2021
8. Thomas, 52, 12/30/2016
9T. Sam Jones, 51, 10/29/1965
9T. Jones, 51, 3/28/1967 (playoffs)
9T. Ray Allen, 51, 4/30/2009 (playoffs)
12T. Bob Cousy, 3/21/1953 (playoffs)
12T. Bird, 50, 3/10/1986
12T. Bird, 50, 11/10/1989
12T. Paul Pierce, 50, 2/15/2006
12T. Tatum, 50, 5/18/2021 (play in game)
Only 2 Celtics have done it more than twice: Bird (4) and Tatum (3). Only 9 Celtics have scored 50+ more than once. And IT is the only other guy to do it twice in one season before Tatum. Sam Jones is the youngest Celtic to go for 50, but Tatum is the youngest to do it more than once.