WALTHAM — You could tell immediately after practice on Sunday that this was no ordinary weekend practice. It’s not often the Celtics practice both days on the weekend but Doc Rivers is giving his team every chance to get prepared for the Miami Heat on Tuesday night.

“We didn’t do much today,” Rivers said. “I really went back and forth with giving them the day off or getting them to run through some stuff. A lot of skeleton today and very little contact and going over our defensive schemes.”

Then, on their own, new players like Von Wafer, Luke Harangody and Semih Erden worked on the offensive sets. The intensity was certainly there.

Tempers flared between Delonte West and Wafer during a post-practice drill, the Celtics continued preparations for the Miami Heat on Sunday at their practice facility.

Wafer, who won the last 15th and final roster spot after the final preseason game last Wednesday, played with Harangody against West and Erden in a 2-on-2 drill as extra time is being spent at the end of practice for new players trying to learn the Celtics offensive sets before they open the season Tuesday night at home. Wafer and West exchanged words after West drove to the basket and beat Wafer for a couple of buckets.

“Listen it’s game one, even if it wasn’t Miami, everybody is going to be excited,” Rivers said. “This is a special situation. Let’s just be honest. Everybody is excited about it. Our guys try to downplay it until you walk through the locker room and hear them talking about it. The film is on all day, watching Miami. Let’s just go out and have fun and see what we have the next night. We’d like to win them both.

The Celtics play in Cleveland on Wednesday, the night after their season opener against the Heat at TD Garden.