Browne is through Glen Helen now and he is 4.783s down on McLean, so that gap has grown!
Adam McLean comes through Glen Helen still leading, but we need to wait for Browne.
Joe Yeardsley is a retirement now too.
McGuinness says he felt the rear go up the mountain and confirms a rear puncture. Says it was "going great" before that point. Disappointing end for him.
Some reports that it could actually be a puncture for McGuinness. He's had that problem already this week!
So, Adam McLean leads Mike Browne by 2.836s over the line to start the final lap!
McGuinness is coming into the pits! Didn't sound like the bike was a problem. Could well be that he's not comfortable pushing in the damp conditions.
Adam McLean has taken the lead at Cronk ny Mona! He's 3.5s up on McGuinness.
McLean has also taken second from Browne by 0.744s.
McLean has made some inroads into McGuinness at the Bungalow. Lead down to 5.922s.
Big news! Paul Jordan is out at Parliament Square. This has given Browne second at Ramsey, but McGuinness leads by 8.742s.
Through Ramsey on this first lap, McGuinness is 11.687s clear of McLean.
This is a super ride from McGuinness so far. He's hitting the damp patches first, so he's flying a little bit blind.
Paul Jordan has gone into second at Ballaugh, 7s behind McGuinness and 0.531s ahead of Browne.
McGuinness is flying - Brown goes through Ballaugh second, 8s down.
McGuinness has 10.275s over McLean, who is second at Ballaugh for now.
Hefyn Owen is reported as a retirement.
McGuinness is the first through Ballaugh. Dean Harrison follows through but is 13s down.
Paul Jordan is third through Glen Helen and is just 0.395s down on Browne. Good fight for the lead at the moment.
Not a great start for Davey Todd. He's only eighth through Glen Helen.
Browne is now in second at Glen Helen and is 4.820s behind McGuinness. So Browne on the Norton is flying.
McLean moves up to second, by still 8.3s behind McGuinness.
Shaun Anderson has retired at the Railway Inn. Hard luck for last year's class winner.
McGuinness leads by almost 10 seconds from Harrison and Yeardsley through Glen Helen.
The top 20 riders are now on the course. We have 31 bikes taking part in this race.
Adam McLean now starts, from Davey Todd, Mike Browne, Paul Jordan and Conor Cummins.