| Robert Williams III Tips 2020-2021 | Stats Glossary  |
| Games with .603 or more Free-throws percentage | Boston Celtics Record : 12 - 2 | Robert Williams III |
| No | Date | Game | Res | Score | Free-throws percentage |
| 1 | May 18 | vs Washington | W | 118-100 | 1.00 |
| 2 | Apr 4 | vs Charlotte | W | 116-86 | 1.00 |
| 3 | Apr 2 | vs Houston | W | 118-102 | .667 |
| 4 | Mar 27 | at Oklahoma_City | W | 111-94 | .833 |
| 5 | Mar 26 | at Milwaukee | W | 122-114 | 1.00 |
| 6 | Mar 14 | at Houston | W | 134-107 | .667 |
| 7 | Mar 4 | vs Toronto | W | 132-125 | 1.00 |
| 8 | Mar 2 | vs L.A.Clippers | W | 117-112 | .625 |
| 9 | Feb 26 | vs Indiana | W | 118-112 | .667 |
| 10 | Feb 9 | at Utah | L | 108-122 | 1.00 |
| 11 | Jan 24 | vs Cleveland | W | 141-103 | 1.00 |
| 12 | Jan 22 | at Philadelphia | L | 110-122 | 1.00 |
| 13 | Jan 6 | at Miami | W | 107-105 | 1.00 |
| 14 | Jan 4 | at Toronto | W | 126-114 | 1.00 |
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