Fresh off an upset of the Boston Celtics in round one in Game 7 on Saturday night, Philadelphia 76ers star center Joel Embiid immediately turned his attention to the Eastern Conference Semifinals. More News: Celtics Make Ugly NBA History in Game 7 Loss to 76ersThe 76ers were down 3-1 to the Celtics in the series before winning three consecutive games, including a 109-100 victory in Game 7 in front of a crowd of 19,156 at TD Garden. Embiid, who had emergency appendectomy surgery on April 9, made his first appearance in the series in Game 4. He played the hero for Philadelphia…