(Corrects stage Sagan pulled clear in para 2, amount of wins Cancellara was seeking in para 3 and stage that Sagan and Kwiatkowski made decisive move in para 7) April 3 (Reuters) - World champion Peter Sagan won the Tour of Flanders to secure his maiden 'Monument' victory after riding clear on the last hill of the one-day classic on Sunday. The Slovak, who had three previous top-five finishes in the race, pulled clear of Belgian Sep Vanmarcke near the end of the classic. The Tinkoff rider, who broke a wheel early in the race, crossed the line 25 seconds ahead of Swiss Fabian Cancellara, who was aiming to become the first man to win the Belgian classic four times. More...