With just two weeks left in the regular season, there are three spots still open on The Chase Grid for non-race winners to fill heading into Sunday night’s Bojangles’ Southern 500 at Darlington Raceway.  With Kyle Larson’s win two days ago at Michigan International Speedway, thirteen drivers have been victorious thus far in 2016 including Matt Kenseth, Kyle and Kurt Busch, Carl Edwards, Jimmie Johnson, Brad Keselowski, Joey Logano, Kevin Harvick, Martin Truex Junior, Denny Hamlin, Tony Stewart and Chris Buescher.  All are within the requisite top thirty of the standings, which currently leaves a maximum of three post-season spots available based on the point standings.  Jamie McMurray, Larson’s teammate at Chip Ganassi Racing, holds a fifteen-point lead over Richard Childress Racing’s Ryan Newman in the fight for what would be the final “playoff” spot … If the Chase for the NASCAR Sprint Cup began today, Austin Dillon and rookie Chase Elliott would hold the two other berths.  Any driver who hasn’t yet won but reaches Victory Lane in either of the next two races would qualify for the post-season, provided that driver was among the top thirty in points, and would reduce the number of spots available based on the regular-season standings … With the post-season now right around the corner, the race for the Number-1 seed on The Chase Grid seems to be coming down to a two-man battle between Kyle Busch and Brad Keselowski.  Each has four wins.  Busch has one Cup Series victory at Darlington, in 2008.  Keselowski is winless at the track “Too Tough to Tame.”  He finished second to Carl Edwards there last summer.