Spurs underperform in back-to-backs

At one level, the talk about the Spurs in the 2nd game of a back-to-back is overblown.  Since the 2005-06 season, the Spurs are 43-29 straight-up in these games (28-24 on road; 15-5 at home), including 0-2 this year (both road games).  But they actually underperform, to the extent they are 27-45 (37.5%) against the spread (ATS), which is an indicator of whether you are playing well in those games.  The league average is 49.2% ATS.  Certainly, you could be playing at home against the Grizzlies, and not play that well, yet still win, so that's the value of the ATS number.  This year, we have 17 of such games, but what's really disturbing to me is that 15 of the 17 are coming away from home.  That's generally the case that most come on the road, but the NBA league average is 68% away, so 15 of 17 (88%) away from home is well off the average.  In the past 3 seasons, our average was 29% at home; 71% of the games away.