| Robert Williams III Rankings 2020-2021 | Stats Glossary  |
| Games with .671 or more Field-goals Percentage | Boston Celtics Record : 16 - 12 | Robert Williams III |
| No | Date | Game | Res | Score | Field-goals Percentage |
| 1 | May 18 | vs Washington | W | 118-100 | 1.00 |
| 2 | May 9 | vs Miami | L | 124-130 | 1.00 |
| 3 | May 5 | at Orlando | W | 132-96 | .800 |
| 4 | Apr 11 | at Denver | W | 105-87 | .833 |
| 5 | Apr 6 | vs Philadelphia | L | 96-106 | 1.00 |
| 6 | Apr 4 | vs Charlotte | W | 116-86 | .778 |
| 7 | Apr 2 | vs Houston | W | 118-102 | 1.00 |
| 8 | Mar 24 | at Milwaukee | L | 119-121 | .750 |
| 9 | Mar 22 | at Memphis | L | 126-132 | .778 |
| 10 | Mar 19 | vs Sacramento | L | 96-107 | .750 |
| 11 | Mar 17 | at Cleveland | L | 110-117 | .857 |
| 12 | Mar 16 | vs Utah | L | 109-117 | .700 |
| 13 | Mar 14 | at Houston | W | 134-107 | 1.00 |
| 14 | Mar 4 | vs Toronto | W | 132-125 | .800 |
| 15 | Mar 2 | vs L.A.Clippers | W | 117-112 | .800 |
| 16 | Feb 26 | vs Indiana | W | 118-112 | .750 |
| 17 | Feb 19 | vs Atlanta | W | 121-109 | .750 |
| 18 | Feb 17 | vs Atlanta | L | 114-122 | .800 |
| 19 | Feb 16 | vs Denver | W | 112-99 | 1.00 |
| 20 | Feb 3 | at Sacramento | L | 111-116 | 1.00 |
| 21 | Jan 30 | vs L.A.Lakers | L | 95-96 | 1.00 |
| 22 | Jan 27 | at San_Antonio | L | 106-110 | 1.00 |
| 23 | Jan 6 | at Miami | W | 107-105 | 1.00 |
| 24 | Jan 4 | at Toronto | W | 126-114 | .800 |
| 25 | Dec 30 | vs Memphis | W | 126-107 | .750 |
| 26 | Dec 29 | at Indiana | W | 116-111 | 1.00 |
| 27 | Dec 27 | at Indiana | L | 107-108 | .857 |
| 28 | Dec 23 | vs Milwaukee | W | 122-121 | 1.00 |
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