Q: Context: The 2017 U.S. Open Championship was the 117th U.S. Open, held June 15 -- 18, 2017 at Erin Hills in Erin, Wisconsin, northwest of Milwaukee. The event was won by Brooks Koepka, who claimed his first major after finishing with a final score of 16 under par. This score matched the lowest score ever attained at the tournament, a record set in 2011 by Rory McIlroy.

Question: who won this year's us open golf? Let's give stream of consciousness first:
The relevant information to answer the above question is: The event was won by Brooks Koepka, who claimed his first major after finishing with a final score of 16 under par. Therefore, the final answer is Brooks Koepka.