| Ron Mercer Rankings 1998-1999 | Stats Glossary  |
| Games with 13 or more Efficiency Recap | Boston Celtics Record : 8 - 12 | Ron Mercer |
| No | Date | Game | Res | Score | Efficiency Recap |
| 1 | May 5 | vs Charlotte | L | 129-133 | 25 |
| 2 | May 1 | vs Milwaukee | L | 79-88 | 16 |
| 3 | Apr 29 | at Miami | W | 107-96 | 17 |
| 4 | Apr 14 | vs Atlanta | L | 70-77 | 16 |
| 5 | Apr 12 | vs Cleveland | W | 103-89 | 19 |
| 6 | Apr 11 | vs Chicago | W | 87-81 | 21 |
| 7 | Apr 8 | at Toronto | W | 101-89 | 15 |
| 8 | Apr 7 | vs Washington | W | 108-87 | 14 |
| 9 | Apr 5 | at Orlando | L | 99-106 | 31 |
| 10 | Mar 28 | vs Indiana | L | 93-101 | 14 |
| 11 | Mar 26 | at Philadelphia | W | 90-84 | 19 |
| 12 | Mar 21 | vs Chicago | L | 92-95 | 19 |
| 13 | Mar 20 | at New_York | L | 78-96 | 15 |
| 14 | Mar 11 | at Atlanta | L | 85-99 | 19 |
| 15 | Mar 7 | at Toronto | L | 92-105 | 26 |
| 16 | Mar 5 | vs Denver | W | 102-94 | 31 |
| 17 | Mar 2 | at Cleveland | L | 99-116 | 19 |
| 18 | Feb 21 | at Washington | L | 75-86 | 14 |
| 19 | Feb 17 | at Vancouver | W | 131-129 | 14 |
| 20 | Feb 16 | at Sacramento | L | 98-101 | 18 |
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