FLORENCE, Italy, Sept 28 (Reuters) - A brutal acceleration helped Dutchwoman Marianne Vos retain her road race world title on Saturday.
The Olympic champion made her move in the steep ramp on the Via Salviati and never looked back, widening the gap to her rivals in the final four kilometres.
Swede Emma Johansson took second place after outsprinting Italian Rossella Ratto.
The Italian team, with double world champion Giorgia Bronzini, were looking to isolate Vos, but she never looked troubled, having Anna van der Breggen to thank after her team mate protected her all day.
In the last of five 16.6-km laps, Vos responded to Johansson's acceleration in awe-inspiring fashion.
Johansson and Ratto chased but quickly realised they were no match for Vos, who now has 13 cycling gold medals from world championships or Olympic Games.
It was also the 26-year-old Vos's eighth consecutive world road race podium after she won the title in 2006 before taking second place five years in a row. (Reporting by Julien Pretot; Editing by Martyn Herman)