>> World number one Dustin Johnson has pulled out of the Masters, the first major golf tournament of the year. Johnson injured his back after falling down a flight of stairs on Wednesday. He made it to the course for practice and to the first tee for the opening round but he wasn't there long before heading back to the clubhouse.
Johnson came to Augusta National with three straight tournament wins under his belt. He also won last year's US Open and had been touted as a favorite to win the Masters. His withdrawal is a blow, not only to Johnson himself but to the many fans who'd come to watch him play.