A top NBA insider offers a grim outlook on Kristaps Porzingis' availability for the rest of the Celtics vs. Knicks series.

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.

Former New York Knicks center Luke Kornet prevented his former team from moving forward on the NBA playoff bracket.

Kristaps Porzingis has always had a tough time dealing with injuries, but this year he is dealing with something entirely new. The Celtics center has had an illness for a few months now ...

ESPN NBA Insider Shams Charania said on ABC’s coverage before Knicks-Celtics Game 3 on Saturday that Porzingis is still dealing with the effects of a virus that had ailed him back in March. Charania said the Celtics star thought he had felt he improved, but things have been up-and-down since the second round began this week.

Brian Windhorst explained why Kristaps Porzingis's mystery illness is concerning, particularly amid the Celtics' 2-0 deficit.