In his eighth career start and first as a PGA Tour member, Grillo won the Frys.com Open in October of 2015, two weeks after winning the Web.com Tour Championship. He turned pro in 2011 and immediately earned status on the European Tour, posting a top-10 finish in his first start, the 2012 Africa Open. Represented Argentina in the World Amateur Team Championship in 2008 and 2010. He qualified for the 2011 U.S. Amateur at Erin Hills, but missed the match-play cut. He is making his third U.S. Open start after tying for 54th in his debut at Oakmont in 2016. Got into this year's field by jumping inside the top 60 in the Official World Golf Ranking after the second cut-off date of June 11.
|2018||Shinnecock Hills Golf Club||76-73||+9||MC|
|2016||Oakmont Country Club||73-70-75-75--293||+13||T-54|