Motegi - Dani Pedrosa of Spain won the Japanese MotoGP on Sunday to claim his third race of the season.
The Repsol Honda rider crossed the finish line with a time of 42 minutes, 47.481 seconds to finish 7.299 seconds ahead of compatriot and 2010 world champion Jorge Lorenzo. Australian rider Casey Stoner finished third, 18.380 seconds behind Pedrosa.
With three races to go, Stoner retains the championship lead with 300 points, followed by Lorenzo on 260 and Andrea Dovizioso, who finished fifth in Sunday's race, on 196 points.
Ducati rider and nine-time world champion Valentino Rossi crashed out on the first lap of Sunday's race.
Rossi was one of several riders who considered skipping the Japan Grand Prix because of concerns after the March 11 earthquake and tsunami that triggered a radiation leakage from a damaged nuclear power plant.
Twin Ring Motegi is 149kms from the Fukushima-Dai-ichi nuclear plant, which leaked radiation after being severely damaged.
Sunday's race was originally scheduled for April, but was postponed after the disaster in March.
Andrea Iannone of Italy took his third Moto2 win of the season while Johann Zarco of France claimed the first Grand Prix win of his career in the 125cc event.
Collated results from the Grand Prix of Japan on Sunday:
MotoGP
1. Dani Pedrosa (ESP/Honda) 42:47.481, 2. Jorge Lorenzo (ESP/Yamaha) at 7.299, 3. Casey Stoner (AUS/Honda) 18.380, 4. Marco Simoncelli (ITA/Honda) 23.550, 5. Andrea Dovizioso (ITA/Honda) 23.691, 6. Ben Spies (USA/Yamaha) 37.604, 7. Nicky Hayden (USA/Ducati) 39.167, 8. Colin Edwards (USA/Yamaha) 45.023, 9. Hiroshi Aoyama (JPN/Honda) 49.074, 10. Randy de Puniet (FRA/Ducati) 59.022, 11. Cal Crutchlow (GBR/Yamaha) 1:13.964, 12. Kousuke Akiyoshi (JPN/Honda) 1:21.709, 13. Shinichi Ito (JPN/Honda) 1:26.381
Retired: Toni Elias (ESP/Honda), Alvaro Bautista (ESP/Suzuki), Damian Cudlin (AUS/Ducati), Hector Barbera (ESP/Ducati), Valentino Rossi (ITA/Ducati)
Overall standings
1. Casey Stoner (AUS/Honda) 300 pts, 2. Jorge Lorenzo (ESP/Yamaha) 260, 3. Andrea Dovizioso (ITA/Honda) 196, 4. Dani Pedrosa (ESP/Honda) 195, 5. Ben Spies (USA/Yamaha) 156, 6. Valentino Rossi (ITA/Ducati) 139, 7. Nicky Hayden (USA/Ducati) 123, 8. Marco Simoncelli (ITA/Honda) 119, 9. Colin Edwards (USA/Yamaha) 98, 10. Hiroshi Aoyama (JPN/Honda) 94, 11. Hector Barbera (ESP/Ducati) 77, 12. Alvaro Bautista (ESP/Suzuki) 67, 13. Cal Crutchlow (GBR/Yamaha) 57, 14. Karel Abraham (CZE/Ducati) 50, 15. Toni Elias (ESP/Honda) 47, 16. Randy de Puniet (FRA/Ducati) 39, 17. Loris Capirossi (ITA/Ducati) 29, 18. Kousuke Akiyoshi (JPN/Honda) 7, 19. John Hopkins (USA/Suzuki) 6, 20. Shinichi Ito (JPN/Honda) 3
Moto2
1. Andrea Iannone (ITA/Suter) 43:25.007, 2. Marc Marquez (ESP/Suter) at 1.999sec, 3. Thomas Luthi (SUI/Suter) 3.686, 4. Stefan Bradl (GER/Kalex) 4.313, 5. Simone Corsi (ITA/FTR) 4.647
Overall standings
1. Marc Marquez (ESP/Suter) 235 pts, 2. Stefan Bradl (GER/Kalex) 234, 3. Andrea Iannone (ITA/Suter) 157, 4. Alex De Angelis (SMR/Motobi) 132, 5. Simone Corsi (ITA/FTR) 126, 6. Bradley Smith (GBR/Tech3) 121, 7. Thomas Luthi (SUI/Suter) 121, 8. Esteve Rabat (ESP/FTR) 74, 9. Yuki Takahashi (JPN/Moriwaki) 71, 10. Aleix Espargaro (ESP/Pons Kalex) 65
125cc
1. Johann Zarco (FRA/Derbi) 39:49.968, 2. Nicolas Terol (ESP/Aprilia) at 5.900sec, 3. Hector Faubel (ESP/Aprilia) 13.605, 4. Maverick Vinales (ESP/Aprilia) 16.191, 5. Sandro Cortese (GER/Aprilia) 23.422
Overall standings
1. Nicolas Terol (ESP/Aprilia) 261 pts, 2. Johann Zarco (FRA/Derbi) 230, 3. Maverick Vinales (ESP/Aprilia) 190, 4. Sandro Cortese (GER/Aprilia) 180, 5. Jonas Folger (GER/Aprilia) 140, 7. Hector Faubel (ESP/Aprilia) 139, 6. Efren Vazquez (ESP/Derbi) 129, 8. Sergio Gadea (ESP/Aprilia) 103, 9. Luis Salom (ESP/Aprilia) 87, 10. Danny Kent (GBR/Aprilia) 76