He was still three behind the joint leaders, Hay and Jordan Sundborg, going into the final day over the Hilton course but he set about his task with purpose.
Three-under to the turn, Bryce made further gains on the 10th and 12th before striking a telling blow on the par-five 16th where he two-putted for birdie from 20-feet.
That set the target and Bryce could only twiddle his thumbs in the clubhouse and wait to see if it would be good enough.
Maclean made a valiant effort to reel him in with two birdies on his last four holes but his 66 left him a shot shy.
Hay, meanwhile, birdied the 16th to get to within a stroke but he couldn’t winkle out another birdie to draw level and had to settle for the joint runners-up spot.