The U.S. Open teed off a week ago, but champ Bryson DeChambeau's living it up like he just sank the tourney-winning putt ... partying, trophy in hand, in downtown Nashville -- and it's awesome!
The 30-year-old champ was seen walking the streets of Tennessee's capital with the U.S. Open trophy ... as Bryson and his new hardware got in line to enter a bar on Broadway.
It is unclear if Bryson was meeting up with friends, family, or a mix of both .