Prior to every game, the two high-definition TVs in the home locker room at TD Garden typically show video of the Celtics’ previous matchup with that night’s opponent. Some players, like Jeff Green and Brandon Bass, watch raptly while others hardly pay attention. But the TVs almost always show Celtics and their opponent, even if the last meeting was months ago. Not on Sunday, though. As the Celtics prepped for the Wizards in a rare early-evening game, they watched tape of Washington’s victory over the Pacers from the previous night. In this case, Celtics coach Doc Rivers did not see much use in reliving any of his team’s earlier matchups, when the Wizards were without their superb young point guard, John Wall. “When you watch them play compared to before, it’s slow motion in our three games against them earlier in the year and how they play now,” Rivers said. “I burned that tape. I didn’t show one clip from those games, because it’s not the same team. Nene wasn’t there a couple, either, so they’re just a different team.” Before the Celtics’ 107-96 victory over the Wizards on Sunday, it was clear that Washington is a much better team than its 29-47 record suggested. The Wizards entered Sunday 24-19 with Wall in the lineup, having posted the fifth-best record in the Eastern Conference since Wall returned in mid-January. As Rivers mentioned, Nene’s presence has played a role in the improvement as well, but no single player has had as noticeable an impact as Wall. There might be a very different feeling in Washington if Wall had been healthy all season and the Wizards were battling for home-court advantage in the playoffs, not fighting to avoid their fourth 50-loss season in five years. (The lone exception is last season, when they lost 46 games in the lockout-shortened 66-game campaign.) “John’s just a unique player,” Wizards coach Randy Wittman said. “His pace that he creates in a game, you can’t duplicate. When he came back and he finally got back into game shape, where he could perform at the level he’s capable of, that just really helped us from an offensive standpoint.”