Former Ryder Cup player Andy Sullivan credited a renewed sense of focus after claiming a share of the halfway lead in the Commercial Bank Qatar Masters.
Sullivan carded a second consecutive 66 at Education City Golf Club in Doha to reach 10 under par, a feat matched late in the day by Spain's Jorge Campillo.
England's Oliver Fisher, who carded the first 59 in European Tour history in 2018, is a shot off the pace alongside France's Romain Langasque, Joost Luiten of the Netherlands and the Swedish pair of Alexander Bjork and Marcus Kinhult.
Cormac Sharvin was the only Irish golfer to make the cut, carding a 69 to reach two under at the halfway point.
Sullivan, who won three times in 2015 to book a Ryder Cup debut the following year, said: "I've got it under lock at the moment. I feel like I am in control of myself, which is the most important thing for me.
"I really felt like I took my time a little bit more on shots and stuff. When I have been doing well before I generally rush the shot, maybe try to hit it a bit quickly, so I have been trying to take my time a little bit more and be a bit more composed over the shot.
"I feel like I have grown up a little bit now on the golf course. I think that having a laugh on the golf course is all well and good and I still enjoy it, but for me I have really had to knuckle down the past two days to keep myself in check because there are times when I find myself wandering.
"It has been difficult, and it is something new for me, trying to keep focused for so long, normally I drift in and out a little bit, but it's been really good and positive signs as the golf has been really good."