It's Race 1 victory for Toprak Razgatlioglu at Most. Nicolo Bulega six seconds adrift in second, Petrucci completes the podium.
Alex Lowes and Alvaro Bautista complete the top-five, Sam Lowes takes sixth.
Razgatlioglu with almost 5s onto the final lap.
Bautista tried a move on Lowes at the penultimate turn, but he gets it done on the front straight as they begin the last lap.
Two laps to go for Razgatlioglu, he has 4.5s over Bulega.
Bautista now closing in on Sam Lowes for fifth.
Remy Gardner has retired.
Bautista now through on Lecuona for sixth on the front straight as they begin lap 19.
Razgatlioglu now ovrer 4s clear of Bulega.
Bautista's charge is continuing. He's closing on Lecuona now for sixth, and the two Loweses not too far up the road from there with five to go.
2.7s now for Razgatlioglu.
Bautista still moving through the field, up to seventh now past Montella who's having a solid ride.
Razgatlioglu back down to a 31.3 that time as Bulega drops into the 1:32s. 2.4s between them now, Bulega has three seconds back to Petrucci.
Bulega keeps Razgatlioglu to within 1.5s that time by. Tyre wear concerns for Razgatlioglu?
1.6 seconds now for Razgatlioglu.
Alex Lowes has come back through on his brother for fourth place.
Razgatlioglu really checking out now, another 31.1 puts him over a second clear of Bulega.
Bulega still has over two seconds back to Petrucci, though, so safe in second for now.
Another lap record for Razgatlioglu that time, a 1:31.109.
Bulega now 0.7s back.
Bautista now up to eighth past Xavi Vierge.
Bulega still sticking with Razgatlioglu for now, race lap record for Razgatlioglu that time, though.
Further back, Bautista has fought his way up into the top-10 in ninth place.
All even at the front that time around. Petrucci now almost two seconds off the lead, but he's making third his own - over two seconds ahead of Sam Lowes, who has passed Alex Lowes for fourth.
Gerloff has just run on at turn one while battling with Bassani. He's rejoined between Bassani and Sofuoglu in 12th.
Razgatlioglu opened the gap in the middle of that lap, but Bulega closed back in to within a couple of tenths over the line. Pace back into the low-1:31s.
Razgatlioglu leads again over the line, 0.2s ahead of Bulega. Petrucci still that second behind in third place.
Bulega holding onto Razgatlioglu for now, only a couple of tenths between them.
No change at the front on lap four, but Razgatlioglu is all over Bulega.
And he makes the move on the brakes at turn one to begin lap five.
Bulega leads despite running a bit wide at turn 20, but Razgatlioglu really building the pressure on the championship leader now.
Bulega continues to lead Razgatlioglu, who is now almost a second behind Petrucci.
Bulega leads the opening lap from Razgatlioglu, Petrucci, Alex Lowes, and Sam Lowes.
Bautista 15th after that early contact.
Jonathan Rea up to sixth from 14th on the grid.
Contact in the middle of the pack - van der Mark and Locatelli down, Bautista involved as well but he's carried on.
We're underway for Race 1 at Most, and it's Bulega who takes the early lead ahead of Razgatlioglu - exactly the start Italian needed.
Riders are off on their warm-up lap ahead of Race 1 in Most.