An 8th-place finish in the Open de Suede Vargarda was enough to secure the overall title. For the 2015 season, Deignan stated again her intention to build towards the UCI Road World Championships. She claimed the first overall win of her career taking the Ladies Tour of Qatar stage race, as well as winning two stages. Deignan then went on to take victories at the one day World Cup races Trofeo Alfredo Binda and the Philadelphia Cycling Classic, along with the Boels Rental Hills Classic. In June, Deignan was forced to pull out of The Women's Tour after colliding with a group of photographers seconds after winning the first stage of the tour in Suffolk. However, ten days later she had recovered sufficiently to win convincingly the British National Road Race Championships for the third time taking her to the top of the UCI world rankings. In August, she sprinted to victory in the final World Cup race of the season, the GP de Plouay, to retain her World Cup title ahead of her main challenger, Anna van der Breggen. To cap her best season to date, on 26 September, Deignan won the World Championships road race in Richmond, Virginia, USA, beating van der Breggen in a sprint from a small group of nine riders at the finish line, becoming the fourth British woman to win the world road race title after Beryl Burton, Mandy Jones and Nicole Cooke. Deignan's stated aim for the 2016 season was the road race at the 2016 Olympic Games, and she started the season as she had finished off the previous one, securing a number of one day race wins, as well as a General classification victory, breaking any curse of the rainbow jersey. Deignan took four victories in the inaugural UCI Women's World Tour; Strade Bianche, Trofeo Alfredo Binda, Tour of Flanders and the overall title at The Women's Tour. Deignan also took victories in the Boels Rental Hills Classic and Omloop Het Nieuwsblad. At the Games, she finished just outside the medals in fifth place. In 2016, Deignan avoided a ban from cycling that would have prevented her from competing in the Olympic Games. The charges against her were that she missed three drugs tests within a 12-month period (20 August 2015, 5 October 2015 and 9 June 2016), an offence that could have led to a four-year ban. However, at the Court of Arbitration for Sport, Deignan argued that the first missed test was not a fault of her own but rather that of the testing authorities.