Brooks Koepka’s girlfriend may not want to watch the replay of her boyfriend’s U.S. Open win. After the year old golfer won his first .This post has been updated. When year old Brooks Koepka walked off the th green at Erin Hills on Sunday as the U.S. Open champion, Fox’s . Brooks Koepka captured the U.S. Open title at Erin Hills in Erin, Wisconsin, and he celebrated with girlfriend Jena Sims shortly .Brooks Koepka won his first career major when he captured the US Open on Sunday with a combined score of under for the tournament, tying a US . Brooks Koepka won his first major at the U.S. Open Sunday but it’s his super hot model girlfriend who’s the REAL winner. Meet year old Jena Sims .