Theo Ratliff led the NBA in Blocks in 1998-99 with 9.
Theo Ratliff shares the top spot with Chris Webber.
| Rk | Player | Team | Date | Value |
|---|---|---|---|---|
| 1 | Theo Ratliff | PHI | 1999-03-24 | 9 |
| 2 | Chris Webber | SAC | 1999-02-07 | 9 |
| 3 | Alonzo Mourning | MIA | 1999-04-19 | 9 |
| 4 | Alonzo Mourning | MIA | 1999-04-03 | 9 |
| 5 | Shawn Bradley | DAL | 1999-03-02 | 9 |
| 6 | Theo Ratliff | PHI | 1999-02-16 | 8 |
| 7 | David Robinson | SAS | 1999-04-05 | 8 |
| 8 | Dikembe Mutombo | ATL | 1999-02-05 | 8 |
| 9 | Dikembe Mutombo | ATL | 1999-04-25 | 8 |
| 10 | Shawn Bradley | DAL | 1999-03-24 | 8 |
| 11 | Marcus Camby | NYK | 1999-02-11 | 8 |
| 12 | Marcus Camby | NYK | 1999-04-26 | 7 |
| 13 | Alonzo Mourning | MIA | 1999-03-02 | 7 |
| 14 | Alonzo Mourning | MIA | 1999-02-15 | 7 |
| 15 | Patrick Ewing | NYK | 1999-02-21 | 7 |