Porzingis: 'Frustration' was high in Celtics' loss to BullsKristaps Porzingis address Celtics' loss to the Bulls, saying they played hard and came out on top.<p><em><a href="https://www.nbcsportsboston.com/nba/boston-celtics/celtics-videos/porzingis-frustration-was-high-in-celtics-loss-to-bulls/675433/?partner=yahoo&cid=yahoo">Porzingis: 'Frustration' was high in Celtics' loss to Bulls</a> originally appeared on <a href="https://www.nbcsportsboston.com?cid=yahoo">NBC Sports Boston</a></em></p>