| Tim Duncan Rankings 1998-1999 | Stats Glossary  |
| Games with 26 or more Efficiency Recap | San Antonio Spurs Record : 29 - 6 | Tim Duncan |
| No | Date | Game | Res | Score | Efficiency Recap |
| 1 | Jun 25 | at New_York | W | 78-77 | 29 |
| 2 | Jun 23 | at New_York | W | 96-89 | 35 |
| 3 | Jun 18 | vs New_York | W | 80-67 | 33 |
| 4 | Jun 16 | vs New_York | W | 89-77 | 43 |
| 5 | May 31 | vs Portland | W | 86-85 | 27 |
| 6 | May 29 | vs Portland | W | 80-76 | 29 |
| 7 | May 23 | at L.A.Lakers | W | 118-107 | 43 |
| 8 | May 22 | at L.A.Lakers | W | 103-91 | 41 |
| 9 | May 11 | vs Minnesota | L | 71-80 | 29 |
| 10 | May 9 | vs Minnesota | W | 99-86 | 36 |
| 11 | May 5 | at Golden_State | W | 88-81 | 26 |
| 12 | May 2 | vs Utah | W | 84-78 | 29 |
| 13 | Apr 29 | at Vancouver | W | 99-72 | 26 |
| 14 | Apr 27 | at Sacramento | L | 100-104 | 32 |
| 15 | Apr 26 | at L.A.Clippers | W | 94-88 | 27 |
| 16 | Apr 24 | vs L.A.Lakers | W | 108-81 | 30 |
| 17 | Apr 20 | at Utah | W | 83-69 | 40 |
| 18 | Apr 12 | vs Phoenix | W | 94-77 | 30 |
| 19 | Apr 5 | vs Golden_State | W | 93-86 | 33 |
| 20 | Apr 1 | vs Vancouver | W | 103-91 | 43 |
| 21 | Mar 30 | vs Seattle | W | 95-87 | 26 |
| 22 | Mar 27 | vs Dallas | W | 99-77 | 33 |
| 23 | Mar 25 | at Denver | W | 86-65 | 30 |
| 24 | Mar 20 | at Vancouver | W | 92-88 | 28 |
| 25 | Mar 19 | at Portland | L | 85-90 | 40 |
| 26 | Mar 16 | at Sacramento | W | 121-109 | 36 |
| 27 | Mar 7 | at Denver | W | 106-96 | 35 |
| 28 | Mar 6 | vs L.A.Clippers | W | 114-85 | 32 |
| 29 | Mar 4 | at Dallas | W | 95-79 | 30 |
| 30 | Mar 2 | at Houston | W | 99-82 | 28 |
| 31 | Feb 28 | vs Utah | L | 87-101 | 27 |
| 32 | Feb 21 | vs Detroit | W | 85-64 | 28 |
| 33 | Feb 19 | at L.A.Lakers | L | 94-106 | 26 |
| 34 | Feb 11 | at Cleveland | L | 89-99 | 28 |
| 35 | Feb 5 | vs Sacramento | W | 101-83 | 31 |
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