Tonight is a must-win game for LeBron and company. James, his teammates and coaches are feeling pretty good about their chances, despite having their backs very much up against the wall in Boston. Per NBA.com and the Sun-Sentinel: “Regardless of how you get here, 3-2, it’s a great opportunity for us,’ Erik Spoelstra said. ‘All we have to do is win one on each court to take the next step toward our dream. Our guys fully understand that.’ [...] Winning a Game 6 in Boston and forcing a Game 7 back in Miami on Saturday would indeed be something special for the Heat. And Spoelstra’s mood eight hours before game time is an indication that they’re thinking positive. ‘Maybe we’re all too stubborn,’ Spoelstra said. ‘I don’t know. But we’re coming into this game with a lot of confidence.’ [...] LeBron James will have to get past his playoff nemesis and ultimately win a championship before changing the perception. If the Heat lose Thursday, it will mark the third time in five years James has been eliminated from the postseason by Boston. ‘They definitely come up,’ James said. “Of course, it’s human for them to come up. But you got to approach [Thursday] like it’s its own and we look forward to the challenge. I know I do.’ The Heat’s lone win at Boston during the their forgettable 16-game stretch came in Game 4 of last year’s conference semifinals. James was the hero with 35 points and 14 rebounds. The circumstances were different then, with the Heat entering that game ahead 2-1 in the series. Now, a performance as such from James is not a bonus. It’s a necessity. ‘I feel confident,’ James said. ‘I feel confident that we can go up and get one. We’re focusing on Game 6 in this series. That’s what it’s all about.’”