 Complete the following phrase:  After an injury-filled 2013 season, Amos returned to form in 2014. At the 2014 Prefontaine Classic, Amos set a meet record and world-leading time of 1:43.63. At the Herculis IAAF Diamond League, he again set a meet record and world leading mark of 1:42.45. Beating Rudisha for the 2nd time on the season, his performance was the fastest 800m race since the 