Neil Paine at fivethirtyeight.com has studied the numbers behind Jordan Spieth becoming just the fourth since 1958 to win the first two majors and only the 13th time to win back-to-back majors.
Using that and some other numbers, Payne concludes Spieth's chances are not great.
No matter how you cut it, the odds of Spieth finishing off the Grand Slam are still fairly low — about 1 percent, if the probabilities above are any kind of guide.
Especially if he insists on rolling in Monday afternoon.