Englishman Andrew Raitt is alone in second place after a 6-under-par 66. Stephen Scahill was joined in a tie for third place by 1997 Dubai Desert Classic winner Richard Green, Paul McGinley, a three-time winner on the European Tour, and Austrian Martin Wiegele at 5-under-par 67.
Lynn got off to a hot start as he birdied the first and came right back to birdie the second. The Englishman made it three straight to open his round as he dropped in his birdie putt on No. 3.
The 30-year-old moved to minus-4 when he converted a birdie try at the par-4 seventh. Around the turn, Lynn tripped to his lone bogey of the day at the par-4 11th after he was unable to get up-and-down from over the green.
Lynn quickly atoned for that mistake. He reached the par-5 12th in two and drained his 25-foot eagle putt to get to 5 under. Lynn dropped in another birdie putt at the par-3 15th. He grabbed the outright lead with a two-putt birdie at the par-5 closing hole to finish off a career low round.
'The game has been feeling really good the last few months, but my putting has not been great,' said Lynn. 'Today there was a bit of a reversal. I was working on my putting when I got here on Tuesday and something has dropped in, but the game doesn't feel as in control as it has. But it was the lowest round of my career so I'm delighted about that.'
Raitt quickly moved to minus-2 with an eagle at the par-4 second. He ran off seven consecutive pars from there. At the 10th, Raitt stumbled to a bogey.
The 34-year-old Raitt, who had part of his finger bitten off by a dog in 1997, rallied with back-to-back birdies from the 12th. He moved to 4 under with a birdie at the par-3 15th and capped his round with birdies at the 17th and 18th to take solo second.
McGinley, who is trying to battle his way onto the European Ryder Cup squad, started his day with a bogey at the first, but came back with consecutive birdies from the second.
The Irishman picked up his third birdie at the par-3 fifth. McGinley played steady golf from there as he ran off 10 straight pars around the turn. He birdied the 16th to get to minus-3. McGinley capped his round with an eagle at the last to move into a share of third place.
'The bottom line is I am either going to do it or I am not, but the fun is trying,' said McGinley of his attempt to make the European Ryder Cup team. 'It is an exciting thing. It is fun being in the melting pot and trying to make the team. People say you should forget the Ryder Cup, but I don't agree with that. I think you have to enjoy it and enjoy the process.'
Raymond Russell and a pair of Swedes, Per Nyman and Patrik Sjoland, share seventh place at 4-under-par 66. David Park, Ian Poulter, Miles Tunnicliff and David Dixon are one stroke further back at minus-3.
Defending champion Maarten Lafeber spread three birdies and three bogeys over his opening round of even-par 70. He stands in a tie for 45th.