Neil Leverett | James Guy finished sixth in the men's 400m freestyle final, as Sun Yang of China won Gold by over two seconds in at the FINA World Aquatics Championships in Budapest, Hungary. Australia's Mack Horton took the silver, with Italian Gabriele Detti finishing in third, comfortably behind the Chinese.      After a strong start from the Briton, the 21 year old from Bury was left in the waves of his opponents and faded badly over the last 100m in sixth place.   Early battle for position The opening lengths were keenly-fought battle for early positioning, with James Guy, Sun Yang and Park Tae hwan exchanging the lead over the opening four lengths of the Duna Arena pool. With Sun more known for his strong finish over the distance, the Chinese opted to break away early at the halfway stage and opened up a significant lead. With both Mack Horton and Gabriele Detti closing at the top of the pool in Lanes 1 and 2 however, the race...