Marquez stands on top of the podium then and if he can stay on his bike for the rest of the calendar you have to think he will end the season as 125cc champion.
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With a tear in his eye almost visible beneath the helmet, Koyama finished in last position. Marquez's win is his seventh of the season, leaving him second in the standings behind Terol.
Marquez gets the chequered flag ahead of Teron, with Smith in third and Danny Webb in seventh place.
Heartbreakingly for the home crowd after battling into fifth position Koyama Tomoyoshi Koyama fell innocuously and dropped way back in the field.
Apologies for the interruption, Marquez effortlessly passed Terol at the midway stage of the race and has now opened a comfortable lead of two and a half seconds. Cortese's slip off the track cost him the chance of a podium finish and Brad Smith has now opened up a seven second advantage over Espargaro.
The pattern is continuing with Torel and Marquez, then Smith and Espargaro battling it out with fifth-place Cortese - who just recorded the quickest lap of the race - closing into the second contest. Folger also went over in the initial collision that cost Vazquez.
Terol and Marquez have built a substantial gap to Smith and Espargaro who are battling for third spot.
Bradley Smith narrowly escaped being brought down at the start but Vazquez was not as lucky and Norwegian Fagerhaug is also down.
Away we go!!! Terol has taken over from Marquez in the lead with Japanese rider Koyama up to third.
The riders are now away on their warm-up lap. After his nightmare start last time, Marquez will want to get away without drama and press his claims to end what will probably be his only year in the 125s on top of the leaderboard.
The man squeezed between Terol and Marquez in the rankings, Pol Espargaro, is back in seventh spot n the grid, with fourth-overall Britain's Bradley Smith third.
Spanish wunderkind Marc Marquez starts in poll position, ahead of compatriot and standings leader Nicolas Terol.
Hello and welcome to our coverage of the Moto 125cc, the first of three races today at the Grand Prix of Japan.