In what year did the most successful European Ryder Cup captain ever win the U.S. Open?
2010 U.S. Open (golf):  McDowell was the first European to win the U.S. Open in forty years, since Tony Jacklin of England won in 1970, which started a period in which four out of five U.S. Open champions between 2010-14 were European. Tony Jacklin: Anthony Jacklin CBE (born 7 July 1944) is an English golfer, who was the most successful British player of his generation, winning two major championships. Tony Jacklin:  He was also the most successful European Ryder Cup captain ever.
1970