Boston Celtics forward Jaylen Brown agreed to a four-year, $115 million contract extension, his agent told ESPN on Monday afternoon.

The extension, confirmed by agent Jason Glushon, keeps Brown in Boston through the 2023-24 season at an average of $28.75 million per season.

The No. 3 overall pick in the 2016 NBA Draft, Brown was entering the final year of his rookie contract.

The two sides were facing a Monday deadline to work out an extension. If one hadn't been reached, he would have become a restricted free agent next summer.

Brown, who turns 23 on Thursday, averaged 13.0 points and 4.2 rebounds in 74 games (25 starts) last season. Those numbers were down from his 14.5 points and 4.9 rebounds in his second NBA campaign in 2017-18.

NBC Sports said it is the first time Boston has extended a player's rookie deal since Rajon Rondo in 2009.

--Field Level Media

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