Chris Williams went out in 32, four under par, to take a two shot lead into the final nine holes of the Sharjah Senior Golf Masters presented by Shurooq.
The South African started the day one shot behind compatriot James Kingston, who birdied the fourth hole to move to 11 under par.
Williams moved to 14 under after a run of four holes which included three birdies and an eagle, before a bogey on the eighth hole. He parred the ninth to make the turn four under on the day.
Tied for third place are Magnus P Atlevi and Gary Marks on ten under par, while Roger Chapman sits in fifth place just one shot back.
Paul Broadhurst and Steen Tinning are one under par for their third rounds, for a total of eight under with the back nine still to play.
