Sampling all ATP Wimbledon games over the past 10 years, Isner/Mahut was a 35 standard deviation event -- this result is to be expected at most every 1,200 years, based on Chebyshev's inequality.  The U.S. national debt rose by $1,729,000,000 during those 11 hours and 5 minutes -- this result is to be expected every 11 hours and 5 minutes (according to the truth-o-meter at http://www.politifact.com/truth-o-meter/statements/2010/jun/24/vern-buchanan/vern-buchanan-estimates-debt-growth-during-maratho/).