Jayson Tatum has agreed to a five-year, $195M extension with the Celtics, source tells ESPN. Per Wojnarowski, the fifth year of the contract will be a player option.

Source: Adrian Wojnarowski of ESPN

ANALYSIS: Paying Tatum to keep him around long-term in Boston was a mere formality. Last season was a true take-off for the Celtics' star, as he blossomed in the regular season and playoffs, averaging 25.7 points and 10 rebounds per game in the postseason.