Wyndham Clark wasted no time celebrating his U.S. Open victory on Sunday ... TMZ Sports has learned he hit up an L.A. hot spot just hours after securing the big win -- and while he was there, he chugged booze right out of his new trophy!!
The scene at Delilah was awesome ... the 29-year-old got up on a platform in between some tables at the West Hollywood lounge -- and after one of the guys he was with threw some alcohol in his new prize, Clark went to town!!
You can see in video we obtained, he slurped down the drink .