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jim davis/globe staffJeff Green was surrounded by green basketballs to sign at the Celtics’ Media Day at the team’s facility in Waltham.
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jim davis/globe staffFirst-round draft pick Kelly Olynyk smiled while doing a radio interview. Players posed for photos, did promos, and answered questions from reporters.
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jim davis/globe staffGerald Wallace listened to instructions while doing a promotional video.
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jim davis/globe staffHead coach Brad Stevens filmed a promotional video during which he was told to try to appear as if he was stressed on the sidelines.
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jim davis/globe staffJared Sullinger had a laugh during a television shot.
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jim davis/globe staffTeam president Danny Ainge was at the event.