Kristaps Porzingis voiced his frustrations as his illness forced him to leave Game 1 early and had him lacking energy in Game 2.

As the Knicks made yet another soul-crushing run in the fourth quarter Wednesday, all Kristaps Porzingis could do was watch.

When Kristaps Porzingis concluded his first six-minute shift Wednesday night, he looked like he’d just run a marathon. His breathing was heavy. He was visibly fatigued. When he took his seat on the Celtics bench, he dropped his head and stared at the TD Garden parquet.