The Celtics were well on their way to taking care of business in Game 2 as they led by 20 points in the third quarter, but things went downhill fast. The Knicks ended the game on a 23-6 run and walked away with a win after Jalen Brunson hit a pair of clutch free throws.

Unfortunately for Pierce, the Celtics blew a 20-point lead and lost the game by one point. The sports media professional, who was drafted by the Boston team in 1998 and played 15 seasons, kept true to his promise. He documented the long journey on social media.

Former Boston Celtics great Paul Pierce learned a valuable lesson Wednesday: If you make an outlandish prediction on live television, you better be ready to follow through. Pierce paid for that decision Thursday, as he walked 20 miles to the FS1 studio after his Celtics prediction backfired in horrific fashion.