Ranking History For Derek Heaton
Start position
Finish position
(NR) Not ranked
| Season | Start position | Finish position | |
|---|---|---|---|
| 1987-1988 | 123 | ||
| 1988-1989 | 123 | 131 | |
| 1989-1990 | 131 | 142 | |
| 1990-1991 | 142 | 142 | |
| 1991-1992 | 142 | 194 | |
| 1992-1993 | 194 | 271 | |
| 1993-1994 | 271 | 408 | |
| 1994-1995 | 408 |