Horsey started slow at the Royal Greens Golf and Country Club in King Abdullah Economic City, before hitting form on the back nine with seven birdies — including five in a row just after the turn — to take his tally for the day to nine.
“It’s a shock actually. I’ve been playing rubbish the last couple weeks. Didn’t feel like I controlled my ball the first two events,” Horsey said.
“I had a conversation with a pal back home last night, talking a few things through and he suggested something that I work on away from the tournament.
“Knowing me, I thought, well, can’t get any worse, so I may as well try it and here we are. It’s really just how my body is moving — quite sort of technical really. It’s nice to have a feel you can wake up and pick up straight away.”
Former Ryder Cup player Gallacher shot 10 birdies, however bogeys on the 12th and 18th held him back.
“I actually hit it really close to the pin which was good, and managed to hole those sort of 10-foot putts for birdie I had,” Gallacher, who has won two of his four European Tour titles in the Middle East, said.
“It was one of those just go on a roll and kept knocking them in.”
Five-times major winner Phil Mickelson had a round to forget, carding 68 for a share of 31st place.