Paul Waring saw his lead cut to a single shot after the third round of the Abu Dhabi HSBC Championship.
The Englishman started the day five clear but a one-over 73 left the door ajar for the chasing pack.
Waring's 18-under-par total is one clear of Niklas Norgaard, with Tommy Fleetwood, Shane Lowry, Thorbjørn Olesen and Sebastian Söderberg tied for third on 15 under.
Waring found a bunker with his opening tee shot and had to scramble par from eight feet at the first, but looked to have settled down as he birdied the par-five second and hit his tee shot to eight feet at the short fourth.
However, he ran his birdie attempt five feet past and missed the return, before missing birdie putts at the next nine holes.
Finding sand off the tee at the 14th proved costly as he failed to save par from 15 feet.
Waring had produced the shot of his life with a fairway wood to inside four feet at the last on Friday, but 24 hours later ended up in a greenside bunker and had to settle for a 15th par of the day.
Norgaard had four birdies against a single dropped shot in his 69 and admitted he is starting to feel like he belongs at big events following his first DP World Tour win at the Betfred British Masters hosted by Sir Nick Faldo.
Pakistan appointed former captain Sarfaraz Ahmed as head coach of their test team for the two-match series in Bangladesh next month, the country's cricket board said on Saturday.
Coventry City ended their 25-year absence from the Premier League with a 1-1 draw at Blackburn Rovers, securing promotion from the Championship with three games to spare on Friday.
Gujarat Titans adapted to conditions to secure a five-wicket win over Kolkata Knight Riders on Friday, fast bowler Kagiso Rabada said, focusing on tight bowling instead of the explosive batting that has been the hallmark of the Indian Premier League.
Carlos Alcaraz will miss the Madrid Open for the second consecutive year after withdrawing on Friday with a wrist injury, dealing another blow to the world number two's clay court preparations ahead of his French Open title defence.
Novak Djokovic is still working through the injury problems that forced him to miss recent tournaments in Miami and Monte Carlo and said on Friday that he will not feature at next week's Madrid Open, one of the last stops before the French Open.
Dubai Police, in collaboration with the UAE Ministry of Interior, have arrested an Irish fugitive accused of involvement in an organised criminal group linked to international crimes in his home country.
UAE President His Highness Sheikh Mohamed bin Zayed Al Nahyan has met with His Highness Sheikh Hamad bin Mohammed Al Sharqi, Supreme Council Member and Ruler of Fujairah, to discuss national priorities and the country’s continued development.