NBA Star Chris Singleton -- I Blew $10k on Lotto Tix ... Because I Can

Washington Wizards rookie Chris Singleton says he doesn't care that he wasted $10,000 on Mega Millions tickets last week ... 'cause he would've blown the cash in the nightclubs anyway.

The 22-year-old baller -- who recently signed a $7 million contract -- tweeted before he chased the $640 million jackpot last week, “I’m about to drop 10,000 on the lottery and cross my fingers.”

Obviously, Chris lost his ass ... but justified the loss in a statement to the Associated Press this week ... saying it was “either that or blowing it in the clubs.”