Joe Mazzulla heatedly tossed a clipboard in frustration during a Celtics timeout in Game 1

Joe Mazzulla definitely wasn’t pleased with how Game 1 was proceeding.

After the Boston Celtics knocked off the Philadelphia 76ers in dominant fashion in Game 7, you’d expect the same passion headed into the Eastern Conference Final.

Unfortunately, the Celtics had some difficulties in Game 1 against the Miami Heat. Despite leading the Heat at halftime, Miami was able to rip off a 46-25 third quarter to take the lead ahead of the final frame. And Celtics head coach Joe Mazzulla was not happy with the proceedings.

During a timeout, Mazzulla was clearly not pleased with the Celtics’ level of play, as he was seen tossing a clipboard in frustration with his team’s effort.

In the end, the Celtics lost Game 1 by a score of 123-116. Seems like Mazzulla’s frustrations were warranted!

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