Sunday featured a pair of Game 7s, one featuring the Celtics – yuck – winning and the other featuring the Mavericks obliterating the Suns and may serve as vindication for the Lakers. The Dallas Mavericks delivered one of the more shocking beatdowns in recent NBA history on Sunday night, dismantling Phoenix in such complete and thorough fashion that Luka Doncic might own the franchise and city now. From the second quarter on, it was a beatdown that Lakers fans could only have dreamed of giving the Suns this season as revenge for last year’s playoffs. The win, though, did serve…