Results: Espargaro, Terol, Smith, Vazquez, Cortese - Danny Webb finishes 9th.
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Wonderful victory for Espargaro - who is beyond delighted with that!
ESPARGARO DOES IT! Round the outside on the back straight! It looks as if Terol might take it back but he cannot, Espargaro brings it home by a whisker on the final straight!
Espargaro takes the lead!
The rear tyre is sliding but they're side by side... Terol holds him off... just!
Espargaro pushing hard!
Terol shuts the door on him in the first corner, and that's cost Espargaro some time on this final lap!
Espargaro looks quicker on the straights, and he's getting very close to Terol on the back straight here. Does he have the slipstream?
The bike might be wobbling - but it's pace is still good. Espargaro closes just a little on his rival.
Espargaro is battling around these corners here. If he's having to battle the bike he might be best riding conservatively and taking the second place points.
Smith 3 seconds back, but the gap between him and Vazquez is now 6 seconds. Those positions look settled.
Koyama has been sitting quietly in sixth - nobody challenging him. He's having a similar kind of race to Bradley Smith, slightly further down the field.
Espargaro wobbles on those tyres - are the tyres suffering as we get to the latter stages of this race?
After trailling for most of this race Vazquez has found a bit of pace and gets past Cortese to take fourth spot!
Better news for Webb - he's nipped back past Salom for 9th!
As you were - Espargaro and Terol holding the front. Should Espargaro go for broke to take the lead or settle for second?
Smith 2.3 seconds behind the battle at the front, but 2.7s clear of Cortese. No change in the top five - it's Terol, Espargaro, Smith, Cortese, Vazquez.
Strike that - Terol makes some good ground, and reclaims the lead from Espargaro at the very place he lost it four laps ago!
Folger and Rabat are having a tussle for seventh place - that's probably the most interesting battle on track at the moment - the front of the field is fairly processional.
Danny Webb is drifting downfield at the moment - he's currently tenth.
Cortese has lost touch with Smith in fourth, but Vazquez is not causing him any great headaches either.
Smith is back into a lonely third spot - but make no mistake, it would be a good points for the Brit if he can bring the bike home.
If it finished this way... Marquez would be third behind both Terol and Espargaro in the classifications. But we're only halfway through...
Terol has suddenly had an injection of pace and as they cross the line he's closer to Espargaro than Smith!
Smith is definitely closing on Terol here - can he launch an overtaking manoeuvre?
Terol seems to be holding his place in second, though he lost a second of time to Espargaro.
Krummenacher comes into the pits to retire, and there's some booing from the home fans.
Terol sits up and lets Espargaro through early on lap 8! Does he have a mechanical problem?
Smith is in his own little race in third, with about a second to the battle in front and a second's cushion to Cortese.
Krummenacher yet to pick up the message about his black flag - but he's well down the field in any case.
Top 5: Terol, Espargaro, Smith, Cortese, Vazquez
That's a short investigation - Krummenacher is black flagged - his race is over. Scant consolation for Marquez.
More replays of that crash - and there's very little to be said about it other than that it was Krummenacher's fault - he was far too quick going into the corner, and he alone took Marquez out.
The stewards are investigating that Krummenacher/Marquez crash from the first lap!
Danny Webb is having a quietly effective race - he's in seventh, battling Koyama.
Remember - a podium finish for Terol will be enough for him to lead the championship.
A little breathing room for Teorl at the front. Bradley Smith is struggling to keep the pace with the two Spaniards.
Cortese gets past Vazquez, but Vazquez is staying on his tail!
Terol sweeps past Espargaro - and he leads! These two are fighting each other hard - but they both desperately need points while Marquez cannot score.
Top 5: Espargaro, Terol, Smith, Vazquez, Cortese
Cortese making good pace in fifth - he's one of the quickest men on the track.
Smith now drops to third as the two Spaniards with everything to gain sweep past.
Terol and Espargaro are locked in a battle for second - they're trying to get by at every corner.
Replays show that it was Swiss Krummenacher who took Marquez out at the beginning, and the Spaniard was absolutely furious!
... And Smith gets ahead of him on the home straight once again!
Espargaro is ahead of Smith, but he runs well wide...
What drama. Terol up to third ahead of Vazquez, and there's a real chance for Terol to finish top of the classifications tonight.
Marquez is looking to get back on the bike - but no - he's walking away with the stewards!
Smith starts well - and chaos - Marquez is down! Smith leads!
Marquez, Cortese, Terol, Vazquez on the front row. Here we go...
The riders are through their warm-up lap, and we'll have 19 laps of this Aragon course coming up. With a sharp left corner to start it could be an interesting beginning...
For British fans, 4th placed Smith in the championship qualified sixth for the race.
No surprise that Spain has so many MotoGP races in the calendar - the Spanish love it - and three riders from Spain are locked in a battle at the top of the 125cc standings.
Top man from qualifying yesterday was Marc Marquez - 8th pole of the year and top of the standings - he's the man to watch in front of his own fans.
Morning everyone, and welcome to LIVE updates from the Moto GP racing in Aragon. We begin in the 125c class.