Celtics acquiring Josh Richardson from Mavericks after wing opts into final year of his deal, per report

Dallas Mavericks wing Josh Richardson is opting in to the final year of his contract and will be traded to the Boston Celtics, according to The Athletic's Shams Charania. Richardson will now play for his fourth team in four seasons after starting his career with the Miami Heat and then spending single seasons with the Philadelphia 76ers and Mavericks.