Going into the season, Austin Reaves had the highest career TS% for a scoring guard in league history. Through 7 games, he his averaging a career high in TS% at 66.9%. But he is bested by Luka Doncic who is averaging 38 PPG on 67.3 TS%.
https://www.basketball-reference.com/leaders/ts_pct_career.html
Reaves doesn’t qualify yet to be on the leaderboard for career TS% but he would be 6th if he did with only center ahead of him.
Reaves and Doncic’s numbers this season:
https://www.basketball-reference.com/players/r/reaveau01.html
https://www.basketball-reference.com/players/d/doncilu01.html