| Robert Williams III Rankings 2019-2020 | Stats Glossary  |
| Games with 10 or more Efficiency Recap | Boston Celtics Record : 14 - 6 | Robert Williams III |
| No | Date | Game | Res | Score | Efficiency Recap |
| 1 | Sep 5 | vs Toronto | L | 93-100 | 12 |
| 2 | Sep 3 | vs Toronto | L | 103-104 | 12 |
| 3 | Sep 1 | at Toronto | W | 102-99 | 14 |
| 4 | Aug 30 | at Toronto | W | 112-94 | 17 |
| 5 | Aug 11 | at Memphis | W | 122-107 | 17 |
| 6 | Aug 9 | vs Orlando | W | 122-119 | 13 |
| 7 | Aug 7 | at Toronto | W | 122-100 | 13 |
| 8 | Aug 5 | vs Brooklyn | W | 149-115 | 29 |
| 9 | Mar 8 | vs Oklahoma_City | L | 104-105 | 13 |
| 10 | Mar 6 | vs Utah | L | 94-99 | 11 |
| 11 | Mar 4 | at Cleveland | W | 112-106 | 11 |
| 12 | Dec 4 | vs Miami | W | 112-93 | 12 |
| 13 | Nov 29 | at Brooklyn | L | 107-112 | 12 |
| 14 | Nov 25 | vs Sacramento | W | 103-102 | 13 |
| 15 | Nov 22 | at Denver | L | 92-96 | 10 |
| 16 | Nov 11 | vs Dallas | W | 116-106 | 10 |
| 17 | Nov 9 | at San_Antonio | W | 135-115 | 26 |
| 18 | Nov 5 | at Cleveland | W | 119-113 | 14 |
| 19 | Oct 26 | at New_York | W | 118-95 | 15 |
| 20 | Oct 25 | vs Toronto | W | 112-106 | 15 |
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