Problem of this easiest schedule is that Mavs play good against good tams. They have high % of wins against teams with 50% wining. And they lose against Huston and Sacramento and, ... So that easiest seclude sort of turn into toughest schedule for Mavs. Lets hope this will not be the case anymore. And loss against weakest teams were just because of lack of motivation.
Mavericks will be more careful now knowing they need to ensure that they will belong in a rank that will not anymore play for the elimination. Mavericks had already won their last 2 games, so they are in a good momentum now and they could probably continue winning again knowing that Mavericks loves a winning streak.
Washington at Dallas, this is a big game, Washington is also winning lately and they want to be part of the top 10, so let's expect a good matchup, but in the end, I think it will be Mavericks winning the game.