Matthew had a 3-under 69 on the second day of the 36-hole exhibition tournament to finish at 6-under 138 at the Itanhanga Golf Club. McPherson was 1-under after shooting a 72.
When you play well you dont feel tired, Matthew said. Maybe tomorrow I will feel it a bit.
She started her final round with a birdie at the first hole and a bogey on the second, but built her lead with birdies on Nos. 5, 6 and 14.
McPherson had four birdies and four bogeys in her round, with two of the bogeys coming on par-5s.
Angela Park finished third in front of her home fans after a 75 left her nine shots back.
Im not too happy, she said. I thought I would be able to play better here.
Laura Diaz shot a 73 to finish fourth at 4-over.
The unofficial money event featured a 15-player field and a $500,000 purse.