2003 Pacific motorcycle Grand Prix
The 2003 Pacific motorcycle Grand Prix was the thirteenth round of the 2003 MotoGP Championship. It took place on the weekend of 3–5 October 2003 at the Twin Ring Motegi circuit.250 cc classification
125 cc classification
Below are the standings for the top five riders and constructors after round thirteen has concluded.
;Riders' Championship standings
;Constructors' Championship standings
| Constructor | Points |
| 1 |  Honda | 320 |
| 2 |  Ducati | 179 |
| 3 | Yamaha | 143 |
| 4 | Aprilia | 67 |
| 5 | Suzuki | 29 |
- Note: Only the top five positions are included for both sets of standings.
Sete Gibernau
Troy Bayliss