Celtics sign Justin Jackson to a 10-day contract

The Boston Celtics have signed forward Justin Jackson to a 10-day contract. Jackson, 26, has played in 248 games (61 starts) during his four-year NBA career with Sacramento, Dallas, Oklahoma City, and Milwaukee, averaging 6.6 points on 42.7% shooting (32.1% 3-PT, 79.7% FT), 2.5 rebounds, and 1.1 assists. The Houston, TX native played in 34 …