Team Sky rider Chris Froome of Britain in action at the 181.5-km Stage 9 from Nantua
Yates' grip on the white jersey in the Tour was strengthened considerably by the end of Sunday's incidentpacked stage nine from Nantua
to Chambery, as his lead went from 28 seconds over Frenchman Pierre Latour to two minutes and 58 seconds over South African Louis Meintjes.
Team Sky's Thomas suffered a broken collarbone after falling midway through the stage from Nantua
to Chambery, while Australian Porte broke his collarbone and fractured his pelvis in a highspeed crash on the descent of the Mont du Chat late in the day.
Thomas suffered a broken collarbone in his crash while Porte went down on the descent of the Mont du Chat - the last of seven categorised climbs on a brutal 181.5 kilometre stage from Nantua
The Welshman crashed heavily midway through an incident-packed stage nine from Nantua
to Chambery, hitting the deck on the descent of the first hors-categorie climb of the day, the Col de la Biche.
Stage nine from Nantua
to Chambery now looms large, with three hors categorie climbs including the feared Mont du Chat late in the day.
Froome expects the general classification to be blown wide open on today's long haul from Nantua
to Chambery, adding: "It's going to be a monster stage, especially as there will be some tired legs after the fast pace today.
Froome expects the Tour to be "blown wide open" on today's long haul from Nantua
to Chambery, adding: "It's going to be a monster stage, especially as there will be some tired legs after the fast pace we had to ride today.
Geraint Thomas and Richie Porte were forced to abandon the race while Chris Froome retained the overall lead.Colombia's Rigoberto Uran has won stage nine of the 2017 Tour de France from Nantua
to Chambery in another photo finish, ahead of France's Warren Barguil and Britain's Chris Froome.
Fernanda Monteiro de Castro Fernandes (a,*), Eder de Souza Martins (b), Daniella Melo Arnaud Sampaio Pedrosa (a), Maria do Socorro Nantua
The opening block of this year's race will end with a gruelling mountain stage in the Alps with three out-of-category ascents climbed between Nantua
Marli Marques,  Eunice Atsuko Totumi Cunha,  Maria do Socorro Nantua
Evangelista,  Paulo Cesar Basta,  Ana Maria Campos Marques,  Julio Croda  e Sonia Maria Oliveira de Andrade