(CNN) -- Ross Fisher continues to lead the way in the Irish Open in Killarney, but his three-stroke overnight lead has been reduced to a single shot on Saturday.
The Englishman bogeyed two of the final four holes to card a level par 71, 10 shots worse than his remarkable 61 on Friday, to leave him on 12-under-par after 54 holes.
Fisher, 29, leads Italian Francesco Molinari (69) and compatriot Chris Wood, who hit five consecutive birdies in his five-under-par 66
Gonzalo Fernandez-Castano of Spain posted a 68 to lie two strokes behind, while Padraig Harrington and Australia's Richard Green are three strokes back after both recorded rounds of 69.
South Korea's Noh Seung-yul Noh and Anders Hansen of Denmark both shot 70 and are a further shot behind, although still just four strokes off the pace.
Fisher looked to be running away with things at the top of the leaderboard after four birdies in his first seven holes, but a double-bogey on the eighth appeared to unsettle him and he failed to make a birdie on the back nine.
"It was a tough day. Unfortunately I tripped up on eight and obviously I'm disappointed to do 10 shots worse today," Fisher told the official European Tour website.
"I feel like I am still swinging great and holing putts. I just hope that I can go out there tomorrow and try and put today's round to the back of my mind. I'm still the man to catch."