LeBron James tried to summon some "Ted Lasso" magic to give the Lakers a boost in their playoff game Wednesday night by rockin' some show-themed gear -- but even with the power of AFC Richmond on his side ... the King and his squad still fell short in Memphis.

The L.A. superstar sported a blue hoodie with Lasso's fictional soccer team's logo on it as he entered the FedExForum in Tennessee ... clearly hoping it would help draw some good vibes for his team in their closeout game with the Grizzlies.

As you probably know by now ... the Apple TV+ show is all about how Lasso, an American football coach played by Jason Sudeikis, inspires a ragtag soccer team in Europe to improbably win games against all odds.

While James' team wasn't exactly underdogs in the playoff contest with Ja Morant and the Grizz -- the message to L.A. was still loud and clear.

But, the pregame 'fit didn't bring much luck to the Lakers ... they were kicked around for most of the night -- and ended up losing, 116-99. To make matters worse for James, he didn't play his best, scoring just 15 points.

Of course, L.A. will still have two more opportunities to put the Grizzlies away -- Game 6 will go down on Friday ... and if a Game 7 is necessary, it'll happen on Sunday.