Competition close at both ends of NASCAR Cup Series playoff standings

(Photo credit: Mike Dinovo-USA TODAY Sports)

DAYTONA BEACH, Fla. - A dramatic race at Michigan International Speedway over the weekend has meant that for the second consecutive week, the NASCAR Cup Series playoff outlook has undergone a major change -- both atop the standings and on the all-important cutoff line as the series heads to DaytonaInternational Speedway for Saturday night's Coke Zero Sugar 400 (7:30 p.m. ET, NB