Why TNT’s Stan Van Gundy thinks the Celtics have been underestimated

Analyst Stan Van Gundy (above), along with play-by-play voice Brian Anderson, called the first two games of the Celtics’ first-round series with the Nets and will have Game 4 Monday night. Gerald Herbert/AP Photo Stan Van Gundy has seen the Celtics several times in person this season from his perch at the scorer’s table as a color analyst for TNT, and many more watching on television from home.

He saw them during the frustrating, disjointed first half of the season, when no late lead seemed to be safe, and he’s seen them as they’ve morphed into a cohesive, relentless force in the second half.

And Van Gundy, who along with play-by-play voice Brian Anderson called the first two games of the…