"It'll mean quite a lot to be able to come out here and play well," she said after recovering from bogeys at 11th and 12th holes with three late birdies. "It already has made my week. I was so tired in the beginning of the week and now this has happened, so I'm very excited."
Pace could have foundered after losing the two shots to par. But she came right back to birdie the next two holes and then added another at the par-5 17th to join Diaz at 11-under 202.
The 33-year-old, in her 10th year as a pro, wants to keep it simple in the final round at Highland Meadows.
"I play a very similar type of game every time I go out there: Hit the fairways and try to hit the green and make the putt. And so far it's been working," she said. "Hopefully, coming down the stretch it's going to be enough."
It was a day of highs and lows for Diaz, the leader since birdieing her first five holes in an opening 62. She led by four and then three strokes after the first two rounds.
Chasing her first win since 2002, she could have regained the outright lead but left a 7-foot birdie putt short on the 18th to finish with a 71.
Boise, Idaho • Steven Alker shot a 6-under 65 to grab the 54-hole lead at the Albertsons Boise Open on Saturday.
Alker's 20-under 193 total broke the tournament record by two strokes and put the 42-year old New Zealander in position for his second win this season.
Alker has a two-shot lead over Steven Wheatcroft (65) and Zack Sucher (68), who held the first-day lead and shared it after 36 holes.