Pritchard has now connected on five or more 3-pointers in 20 games this season, ranking fourth in the NBA.
The Blazers conclude their seven-game road trip Friday night at Oklahoma City.
PORTLAND (118) — Avdija 5-10 1-2 12, Camara 3-11 4-5 12, Clingan 1-3 0-0 2, Sharpe 11-18 0-0 25, Simons 12-21 3-3 30, Banton 0-1 0-0 0, Murray 1-4 0-0 2, Walker 8-9 0-2 22, Reath 0-2 0-0 0, Henderson 4-11 4-5 13. Totals 45-90 12-17 118.
BOSTON (128) — Hauser 2-9 0-0 5, Horford 4-9 2-2 12, Kornet 1-4 0-0 2, Brown 7-23 4-6 18, White 14-26 4-4 41, Peterson 0-0 0-0 0, Queta 2-5 0-0 4, Davison 0-0 0-0 0, Pritchard 14-20 5-5 43, Walsh 1-1 0-0 3. Totals 45-97 15-17 128.