The Paraguayan finished 19 under par and one shot clear after a final round of 63.
Ireland's Niall Turner finished 4 over par.
Meanwhile, Shane Lowry is 5 under par after round three at the AT&T Pebble Beach PRO-AM.
Seamus Power is 3 under par with Padraig Harraington 3 over par.
Jordan Speith leads the way on 17 under par.
