Smart, 24, produced 10.2 points in 2017-18 to go along with a career-high 4.8 assists and 3.5 rebounds in 29.9 minutes over 54 games played (11 starts).
The longest-tenured Celtic also is a creative tweeter, apparently; he gave a shout-out to Boston's 17 title banners Thursday night using trophy emojis under a picture of him signing the contract alongside C's co-owner Wyc Grousbeck, Ainge, and his agent, Happy Walters.
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Smart, the No. 6 pick in the 2014 draft, found a quiet market in restricted free agency and, after his camp grumbled about Boston's lack of attention early in the summer, the two sides eventually hammered out a deal. While he will never be a knockdown shooter from deep, his value resides in his defensive prowess, playmaking ability and contagious energy.
The Celtics scheduled a news conference for Thursday, but sent a statement canceling that event because Smart "experienced flu-like symptoms earlier this afternoon and is now receiving IV fluids" at a hospital.
Even if Smart doesn't show advancements in his game throughout the deal, it will still become more rewarding as the years go on, simply due to the inevitable salary cap increase. With Kyrie Irving, Jaylen Brown, Terry Rozier and Marcus Smart, the Celtics possess arguably the deepest backcourt in the entire league.