The Boston Celtics are hoping a win tonight will earn the team their 13th straight victory this season — but it won't be easy.

The team could potentially be playing Tuesday evening against the Nets in Brooklyn, without their two biggest star players: point guard Kryie Irving, who suffered a small fracture underneath his right eye during last Wednesday's game against the Lakers, and small forward Gordon Hayward, who fractured his ankle during the season opener. Irving is listed as questionable, but may get some playing time with a face mask.

Peter Roby is Athletic Director at Northeastern University and for six years coached basketball for Harvard University. He says the Celtics "have great chemistry going, with people understanding what their roles are and what's expected of them."  

Despite losing two critical players, the Celtics continue to win. Roby attributes the winning streak to head coach Brad Stevens. "He's a terrific communicator, and a guy who can devise game plans, and take advantage of match-up situations that puts guys in positions where they can be successful."

Stevens, he says, has built a roster with some depth.

Click on the audio player above to listen to the full interview.