American Scott Brown and Argentine Fabian Gomez are tied for the lead after three rounds of the Puerto Rico Open. The duo are four shots clear of their nearest rivals at 18 under par and will go head to head in the final group on Sunday as they chase their first career victories on the PGA Tour. “It&aposs a position I&aposve never been in before,” Brown said after his third round of five-under 67 on Saturday. “But I&aposm playing good. So I look forward to good things.” Gomez will be aiming to become the first Argentine to win on the PGA Tour since Angel Cabrera took out the US Masters in 2009. “It&aposs going to be the first time,” Gomez said. “It&aposs going to be a little hard, a little nerve-racking, so I&aposll just have to stay as relaxed as possible.” There are a host of players within touch should either of the leaders slip up during the final round, with a group of four Americans tied for third place. Blayne Barber, Brian Stuard, Jordan Spieth and Steve LeBrun shared third at minus 14, while another American, Morgan Hoffmann, is alone at 13 under in seventh place. Australia&aposs Matt Jones is one of six players another shot adrift at 12 under, while compatriot Nick O&aposHern is a further two shots back at minus 10.