SGA is averaging 6.5 PPG on 67% TS in clutch time this season, that is the most clutch PPG ever averaged by a player since play-by-play tracking began in 1996.
The previous highest mark was Russell Westbrook in his 2017 MVP season, averaging 6.2 PPG on 57% TS. Dwyane Wade’s 2006-07 season is 3rd at 6.0 PPG on 55% TS.
SGA is also leading the league in clutch-time +/- at +93, and OKC have a record of 20-7 in clutch-games that SGA has played this season.
Source: https://www.nba.com/stats/players/clutch-traditional
Note: The NBA defines “clutch time” as the last 5 minutes of a game within a 5-point margin.