Julian Alaphilippe produced the time trial of his life at the Tour de France to extend his lead in the yellow jersey with victory on stage 13 in Pau.
Alaphilippe completed the lumpy 27km course in a time of 35 minutes flat, beating second-placed Geraint Thomas by 14 seconds to extend his lead in yellow to 86 seconds.
It was an outstanding result from the Frenchman, not a renowned time triallist, as he defied expectations that defending champion Thomas would begin to assert his authority over the race.
There remains an expectation that Alaphilippe will soon fall away from the top of the general classification, but he survived Thursday's first Pyrenean stage without time losses and has now given himself an additional cushion before Saturday's summit finish on the Tourmalet.
While a surprise, Alaphilippe's victory in yellow was certainly fitting as the Tour celebrated the 100th birthday of the maillot jaune, first awarded to the Tour's leading rider on this day in 1919.
Thomas' failure to pick up time was not the only disappointment for Team Ineos as Egan Bernal could only manage 22nd on the stage, 96 seconds down on Alaphilippe, and so slipped from third to fifth on the general classification.
The Colombian conceded the young rider's white jersey to Alaphilippe's Deceuninck-Quick Step team-mate Enric Mas.
Less of a surprise was seeing the time trial cause a shake-up at the top of the standings, with Mitchelton-Scott's Adam Yates and UAE Team Emirates' Dan Martin among the losers.
Ireland's Martin finished 33rd on the day, two minutes six seconds down on Alaphilippe, with Yates one place and two seconds further back.
That sees Yates drop from seventh to 10th, three minutes and 55 seconds down, with Martin in 11th a further 20 seconds back.
French hope Thibaut Pinot - caught out in the crosswinds on stage 10 - performed well and moved himself up to seventh, albeit still three minutes 22 seconds off yellow.
Nicolas Roche came home 115th on the stage, but this was a day for the Team Sunweb man to conserve energy for upcoming stages better suited to his strengths.