Boston Celtics swingman Jaylen Brown posterized Milwaukee Bucks star Giannis Antetokounmpo twice in their second-round series. Unfortunately, he wasn't able to record a third.

On Wednesday night, Brown’s Celtics squared off against the Bucks in Game 5. In the second half, Brown attempted to brutally yam atop the dome of Giannis, but things didn’t turn out well for Brown on this occasion.

As you can see, Brown loses the ball as he’s going up for the cocked-back poster slam, and it careens off the backboard afterwards. Brown was surely trying to add another tremendous slam over Giannis, which he already did in Games 1 and 3.

However, Giannis has undoubtedly learned his lesson. While Brown was to blame for his failure, Antetokounmpo should also be credited for a much-improved defense on the Celtics youngster.

The Bucks went on to win the game, 116-91, and the series 4-1. Remarkably, Antetkounmpo and Co. have never lost to the Celtics since bowing down in Game 1.

Boston now heads to the offseason with plenty of uncertainties surrounding their future. Meanwhile, the Bucks are moving to the Eastern Conference Finals for the first time in 18 years and will look to continue their quest for the NBA championship.

Milwaukee is waiting for the winner of the Philadelphia 76ers-Toronto Raptors series.