| Grant Williams Rankings 2019-2020 | Stats Glossary  |
| Games with 3 or more Rebounds | Boston Celtics Record : 24 - 11 | Grant Williams |
| No | Date | Game | Res | Score | Rebounds |
| 1 | Sep 27 | at Miami | L | 113-125 | 3 |
| 2 | Sep 17 | vs Miami | L | 101-106 | 3 |
| 3 | Sep 1 | at Toronto | W | 102-99 | 4 |
| 4 | Aug 19 | vs Philadelphia | W | 128-101 | 6 |
| 5 | Aug 13 | vs Washington | L | 90-96 | 8 |
| 6 | Aug 11 | at Memphis | W | 122-107 | 3 |
| 7 | Mar 8 | vs Oklahoma_City | L | 104-105 | 3 |
| 8 | Mar 4 | at Cleveland | W | 112-106 | 5 |
| 9 | Mar 3 | vs Brooklyn | L | 120-129 | 3 |
| 10 | Feb 29 | vs Houston | L | 110-111 | 3 |
| 11 | Feb 26 | at Utah | W | 114-103 | 4 |
| 12 | Feb 21 | at Minnesota | W | 127-117 | 3 |
| 13 | Feb 11 | at Houston | L | 105-116 | 4 |
| 14 | Feb 5 | vs Orlando | W | 116-100 | 6 |
| 15 | Feb 3 | at Atlanta | W | 123-115 | 6 |
| 16 | Feb 1 | vs Philadelphia | W | 116-95 | 3 |
| 17 | Jan 30 | vs Golden_State | W | 119-104 | 5 |
| 18 | Jan 28 | at Miami | W | 109-101 | 7 |
| 19 | Jan 26 | at New_Orleans | L | 108-123 | 3 |
| 20 | Jan 24 | at Orlando | W | 109-98 | 4 |
| 21 | Jan 22 | vs Memphis | W | 119-95 | 3 |
| 22 | Jan 20 | vs L.A.Lakers | W | 139-107 | 3 |
| 23 | Jan 15 | vs Detroit | L | 103-116 | 4 |
| 24 | Jan 13 | vs Chicago | W | 113-101 | 5 |
| 25 | Jan 6 | at Washington | L | 94-99 | 6 |
| 26 | Jan 4 | at Chicago | W | 111-104 | 3 |
| 27 | Dec 22 | vs Charlotte | W | 119-93 | 4 |
| 28 | Dec 20 | vs Detroit | W | 114-93 | 3 |
| 29 | Dec 11 | at Indiana | L | 117-122 | 4 |
| 30 | Dec 4 | vs Miami | W | 112-93 | 3 |
| 31 | Nov 15 | at Golden_State | W | 105-100 | 3 |
| 32 | Nov 13 | vs Washington | W | 140-133 | 3 |
| 33 | Nov 9 | at San_Antonio | W | 135-115 | 4 |
| 34 | Nov 1 | vs New_York | W | 104-102 | 4 |
| 35 | Oct 25 | vs Toronto | W | 112-106 | 7 |
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