Doc Rivers and the Philadelphia 76ers came dangerously close to falling behind 3-1 in their Eastern Conference semifinals series against the Boston Celtics on Sunday. Boston took a 115-113 lead with 37.3 seconds remaining in overtime of Game 4 after Celtics superstar forward Jayson Tatum hit a contested 3-pointer. The Sixers then needed a corner 3-pointer from star guard James Harden to regain the lead with 18.2 seconds remaining. That shot would prove to be the game-winner for Philly as the Sixers went on to win 116-115. However, according to Rivers, the game shouldn’t have come down to Harden’s shot.Following Game 4, Rivers spoke about how Tatum should have been called for an offensive foul on his late 3-pointer. This comes as he feels that Tatum pushed off of Sixers guard Tyrese Maxey before attempting the shot:“Jayson Tatum's three was awful that that wasn't called. Awful,” Rivers said.“Did you think it was a push-off? … It was a push-off!"Rivers then spoke about how the game was tightly officiated before Tatum’s three, which only added to his frustration:“The reason that it bugged me is because it’s the end of the game and there were these touch fouls,” Rivers said.“Now, Jayson Tatum has a 360 foul. Marcus Smart gets tangled up; touch foul. So, if we’re gonna call it that way, then you have to call that. To me, you gotta call that play. I know it’s a big play, and I’m a big fan of refs not deciding (games), but that could have decided the game.”SportsCenter@SportsCenter"Jayson Tatum's three was awful that that wasn't called. Awful ... Did you think it was a push off? It was a push off!"Doc Rivers couldn't believe Tatum wasn't called for a foul on this play.1422137"Jayson Tatum's three was awful that that wasn't called. Awful ... Did you think it was a push off? It was a push off!"Doc Rivers couldn't believe Tatum wasn't called for a foul on this play. https://t.co/QYZ16zC552Also read: James Harden pays for Michigan State shooting survivor to attend Game 4James Harden on his monster performance in Game 4 against BostonPhiladelphia 76ers star guard James HardenOn top of his game-winner in Game 4 against Boston, James Harden also had one of the best all-around playoff performances of his career. Harden finished with 42 points, eight rebounds, nine assists, four steals and six 3-pointers on 69.6% shooting.After capping off his big night with an exclamation point, Harden spoke about his strong desire to win:“I just want to win,” Harden said.“Today was do-or-die for us.”Following Game 4, the Sixers and Celtics’ Round 2 series is knotted up at 2-2. Game 5 will take place on Tuesday in Boston.Also read: “I don’t give that s**t any attention” - Anthony Davis gives blunt response to chatter on social medi