Former Australian Rugby League star Jarryd Hayne's NFL experiment is over, as he announced his retirement Sunday from the San Francisco 49ers in order to join the Fiji Rugby Sevens team for the Rio Olympics. ''I simply could not pass that chance up,'' Hayne said. A 6-foot-2, 220-pound running back and special teams player, the 28-year-old Hayne was a surprise to make the initial 53-man roster out of training camp as a rookie last year with San Francisco. More...