Viktor Hovland was forced to withdraw from the Saturday evening fourballs session at the Ryder Cup due to a neck injury. AdvertisementThe "envelope" rule has only ever been needed twice in Ryder Cup history, since it was introduced in 1979. At the 1991 Ryder Cup, American Steve Pate was involved in a car accident in the week leading up to the tournament. In a strange occurrence, American veteran Lanny Wadkins had volunteered to be the man named in the envelope by captain Tom Watson, and sat out what would have been his final Ryder Cup match. AdvertisementBoth Luke Donald and Keegan Bradley will hope the "envelope rule" is not required on Sunday, but we could see an unfortunate piece of Ryder Cup history made should Viktor Hovland be forced out.