Gordon Hayward’s injury changed everything for the Boston Celtics, but perhaps for no individual player more than Marcus Smart. Though the fourth-year guard was set to come off the bench and compete for minutes this season, unfortunate circumstances have made him a starter and one of the Celtics’ most influential offensive players. He was up to the sudden challenge brought on by Hayward’s absence in the second half of his team’s hard-fought, opening-night loss to the Cleveland Cavaliers, scoring 12 points on 5-of-7 shooting via some typically physical post play. Less than 24 hours later, Smart was back on the floor against the Milwaukee Bucks. Worse than his poor performance and Boston’s second straight loss to open the season? The 23-year-old hurt both of his ankles during the game and will likely sit out of Friday’s game against the Philadelphia 76ers as a result.