BOSTON — The Boston Celtics have acquired point guard Isaiah Thomas from the Phoenix Suns for a first-round draft pick and guard Marcus Thornton.

The deal was made on a busy day at the NBA’s trading deadline.

Thomas, 26, is in the first year of a four-year, $27 million contract. He is averaging 15.2 points and 3.7 assists.

He spent his first three seasons with the Sacramento Kings. Last season he averaged more than 20 points and six assists per game.

The Celtics will send Phoenix the 2016 first-round pick they had acquired from Cleveland. Thornton heads to his fifth team in six NBA seasons. In 2011-12, he averaged 18.7 points per game.

Also Thursday, the Celtics sent Tayshaun Prince to the Detroit Pistons for Jonas Jerebko and Luigi Datome.