Mulroy's birdie binge gave him an 8-under-par 64 for the third round and put him at 15-under 201 after 54 holes going into Sunday's final round.
Felipe Aguilar, who had a second-round 64, shot 4-under 68 Saturday and is alone in second at 13-under. Jbe Kruger, the second-round leader, slipped to a 1-over 73 Saturday and is tied with George Murray (69), Hennie Otto (67) and Peter Whiteford, who had a bogey-free 64 Saturday, for third at 12-under.
Mulroy opened Saturday's play with back-to-back birdies and, after a birdie at the sixth hole, was 3-under after 12 holes. He then ran off five consecutive birdies and jumped into the lead.
Aguilar also closed fast, posting birdies on five of his last six holes.
Celebrity Families of 2014 [PHOTOS]