Costa wins as Froome falters
Rui Costa is the new world champion after outsprinting Joaquim Rodriguez at the end of a men's road race which Chris Froome failed to finish.
Costa and Rodriguez had formed part of a four-man breakaway alongside Vincenzo Nibali and Alejandro Valverde on the last of 10 laps of a punishing 16.6km circuit around Florence but later forged clear on their own.
Costa led out the sprint on a flat finishing straight and although Rodriguez almost drew alongside him, the Portuguese rider fended him off to win by half a bike's length after almost seven and a half hours in the saddle.
Froome abandoned the race with just under 100km remaining having lost all of his team-mates and then been dropped by the front group.
None of the eight-man British team finished the race, with Sir Bradley Wiggins climbing off the bike early in the race after falling off the pace and Mark Cavendish stopping as planned having led the peloton for much of the opening 100km.
Much of the 272.2km marathon was played out in torrential rain, which made for miserable riding conditions and caused a constant stream of crashes.
The race had been expected to be a battle between climbers, sprinters and one-day specialists and although all three groups were well represented going into the final lap, it was the climbers who prevailed.
The finishing circuit contained two key ascents - the 4.3km Fiesole and the steep, 600m Via Salviati - and it was on the Fiesole that sprinters such as Peter Sagan and Classics riders such as Fabian Cancellara and reigning champion Philippe Gilbert were distanced.
Italy's Nibali and Spain's Rodriguez did the damage by exchanging attacks up the climb and by the summit they had a small gap over Valverde and Costa, who were the only two men able to follow.
Rodriguez attacked again on the descent and held a small lead going up Via Salviati, but the quartet came back together at the top following a huge effort from Nibali.
Rodriguez attacked once again on the undulating run to the finish and opened up a small gap, but Costa set off in pursuit inside the last 1,500m, caught him with 200m to go and still had enough energy left over to win the subsequent sprint.
His victory completed an outstanding season in which he also won the Tour de Suisse and two stages of the Tour de France.
Earlier in the day, Poland's Bartosz Huzarski formed part of a five-man breakaway and rode for more than 220km at the front of the race, finally being caught just under 30km from home.