The Boston Celtics have tied Jayson Tatum down to a new five-year deal worth a reported $314m (£245m).

The 26-year-old led the Celtics to a record-breaking 18th NBA Championship last season with a five-game victory over the Mavericks.

Tatum, a third overall draft pick in 2017, overtakes team-mate Jaylen Brown as the best player in the NBA.

Brad Stevens, the Celtics’ president of basketball operations, said the franchise is “obviously ecstatic” that Tatum, a four-time All-NBA star, chose to commit his future to them.

Elsewhere, LeBron James’ hopes of playing with his son Bronny for the La Lakers are still alive after he signed a new deal on the west coast.

The 39-year-old signed a two-year extension with the Lakers last week in what is likely to be his final deal with the franchise.

The deal is reportedly worth $104m (£81.5m).

Bronny was selected by the Lakers in the second round of the NBA Draft in June.

LeBron has been open about his ambition to become the first father-son partnership in NBA history by playing with Bronny before the end of his career.