American star Jordan Spieth admitted that his last-minute call to pull out of the Olympics was the "most difficult decision" he has ever had to make. The 22-year-old Texan became the latest big name in men's golf to withdraw on Monday, when the list of players to go to Rio de Janeiro next month was announced. Third-ranked Spieth joined the other members of the world's top four, Jason Day, Dustin Johnson and Rory McIlroy, in pulling out amid widespread concerns over the Zika virus.
