Marcus Smart Pens Emotional Letter To Celtics Fans After Trade To Grizzlies

Marcus Smart is proving goodbyes aren't easy ... the newly traded NBA star just penned an emotional letter to Boston fans after the organization traded him to the Memphis Grizzlies.

"Where do I even begin...as I start to think about the last 9 years I have a lot of emotions running thru me," the 29-year-old wrote Friday on Instagram. "Boston, you are a very special place to me."

The 2021-2022 Defensive Player of the Year was part of a three-team blockbuster trade on Wednesday, involving the Celtics, Grizzlies, and Wizards ... and Smart, who spent his entire 9-year career in Beantown, was sent to Memphis.

Kristaps Porzingis was shipped to the Celtics and Tyus Jones is headed to Washington.

"I grew up here and met some of my best friends here," Smart said. "I'll never forget my time here."

"Ultimately we didn't get that 18th banner but I'm VERY VERY proud of the success we had."

It wasn't just an emotional send-off for Smart ... as many Celtics fans were dismayed over the trade, and expressed their frustrations on social media.

"Marcus Smart has been my favorite player since he was drafted in 2014, and Boston made the playoffs every year since," a fan said on Twitter after the trade. "Regardless of return, I’m very disappointed."

Another fan tweeted, "I am literally dead inside. Not Marcus Smart. There’s no way we traded Marcus Smart. I refuse to believe it."

Unfortunately for Celtics fans, the trade's real ... and now Smart gets a fresh start in Bluff City.