Eight drivers who won in 2013, did not win in 2014:

Eight drivers were shut out of winning a Sprint Cup race in 2014 after winning at least one race in 2013:
#14-Tony Stewart last won at Dover in June 2013 and lost a 15 season win streak, the 4th longest in NASCAR history.
#31-Ryan Newman last won at Indianpolis in July 2013 and lost a 4 season win streak.
Other drivers who won in 2013 and failed to do so in 2014: #20-Matt Kenseth, #16-Greg Biffle, #34-David Ragan, #78-Martin Truex Jr., #55-Brian Vickers and #1-Jamie McMurray.(11-18-2014)