Marcus Osmond Smart is an American professional basketball player for the Boston Celtics of the National Basketball Association (NBA).
He played college basketball for the Oklahoma State Cowboys before being drafted with the sixth overall pick in the 2014 NBA draft.
Due to his tenacious nature, physicality, quick hands, and elite basketball IQ, Smart is widely considered to be one of the most versatile and consistent defenders in the NBA.
Smart is known for his hustle plays, often diving for loose balls and taking charges, actions that earned him the nickname "The Cobra."
He was named the 2021–22 NBA Defensive Player of the Year
the first guard to win the prestigious accolade since Gary Payton in 1996, breaking the longest position drought in the award's history.
Smart is the son of Billy Frank Smart and Camellia Smart, who died of myelodysplastic syndrome on September 16, 2018.