New on SI: Day 1 Playoff Impressions: Sixers' Flop, Kyle Lowry’s Struggles and the Spurs' Inevitability

While it'd be easy to overreact after a Day 1 rife with upsets, it's not quite time to bury the Raptors, Sixers and Nuggets. But there are signs of concern for all three teams that could see them continue to struggle in the NBA playoffs.