Jumbo's Primoz Roglic maintained the overall lead in the Tour de France on Tuesday with eyes now nervously turning to the high altitude showdown awaiting the elite on Wednesday's high altitude Meribel climb.
Bora-hansgrohe's German all-rounder Lennard Kamna won stage 16 after the Tour's first large escape group was allowed to get away over some medium mountains.
Kamna came good on the 164-kilometre run through the Alps by defeating Ineos rider Richard Carapaz over the final stretch after the pair had been part of a rare escape group.
The victory was just reward for the 24-year-old who was pipped to the line on the Puy Mary mountain last week. It was his first Tour de France stage win, and Bora's first this year.
"I saw Carapaz wasn't feeling too good and I went all in and it worked out," said Kamna, also a hot time-triallist who may have a big future.
"I was so disappointed on the Puy Mary, but this puts that behind me."
Almost 17 minutes back, in a region dotted with ski-resorts, the yellow jersey group ascended together with only Tadej Pogacar trying to upset Roglic and his Jumbo-Visma teammates.
Colombia's Miguel Angel Lopez powered past them all over the final 200m but was followed closely over the line with no change at the top except for Nairo Quintana losing a little time.
Roglic leads Pogacar by 40 seconds with five stages remaining. Rigoberto Uran is third at 1min 35sec, while Lopez and Briton Adam Yates round out the top five.
Ineos sent two riders in the breakaway, Carapaz and Pavel Sivakov, the pair who had been supposed to help their leader on the summits, but both of whom fell on day 1.
The British team's captain Egan Bernal suffered a shocking meltdown on Sunday and fell out of contention.
Showing depth of character the 23-year-old Colombian made himself freely available to the press right after his defeat, and here the defeated champion rode with a smile on his face again.
Slovenian pair Roglic and his rival Pogacar are now the major focus of attention on an atypical Tour where Jumbo has knocked Ineos off their perch as the dominant team.
"Everything was under control," said the 30-year-old Roglic, who once again had a posse with him all the way to the finish line.
"But tomorrow will be nicer to watch. It's the Queen stage, the highest point, crazy hard the final 5km. It'll be a fight for every second," said the former ski-jumper who has emerged as the most powerful athlete in Tour cycling over the past three years.
Wednesday's stage 17 leaves the Alpine city of Grenoble and culminates on the Meribel mountain, with sections at 20 percent incline and which climbs to the rarefied oxygen way above the treeline at 2304m altitude.
Earlier Tuesday Tour de France organisers were in exultant mood when announcing that all of their cyclists were negative for Covid-19 in the final round of tests.
Overall standings after stage 16 of the Tour de France, a 164km run between La Tour-du-Pin and Villard-de-Lans on Tuesday:
1. Primoz Roglic (SLO/Jumbo) 70hr 06min 47sec, 2. Tadej Pogacar (SLO/UAE) at 40sec, 3. Rigoberto Uran (COL/EF1) 1:34, 4. Miguel Angel Lopez (COL/AST) 1:45, 5. Adam Yates (GBR/MIT) 2:03, 6. Richie Porte (AUS/TRE) 2:13, 7. Mikel Landa (ESP/BAH) 2:16, 8. Enric Mas (ESP/MOV) 3:15, 9. Tom Dumoulin (NED/JUM) 5:19, 10. Nairo Quintana (COL/ARK) 5:43, 11. Guillaume Martin (FRA/COF) 6:45, 12. Alejandro Valverde (ESP/MOV) 6:52, 13. Damiano Caruso (ITA/BAH) 9:09, 14. Richard Carapaz (ECU/INE) 17:23, 15. Warren Barguil (FRA/ARK) 18:16, 16. Egan Bernal (COL/INE) 19:04, 17. Pierre Rolland (FRA/VCC) 30:03, 18. Sepp Kuss (USA/JUM) 35:06, 19. Peio Bilbao (ESP/BAH) 44:23, 20. Marc Soler (ESP/MOV) 58:58
Green points jersey:
1. Sam Bennett (IRL/DEC) 269 pts, 2. Peter Sagan (SVK/BOR) 224, 3. Matteo Trentin (ITA/CCC) 212, 4. Bryan Coquard (FRA/VCC) 166, 5. Caleb Ewan (AUS/LOT) 158, 6. Wout Van Aert (BEL/JUM) 131, 7. Julian Alaphilippe (FRA/DEC) 130, 8. Michael Morkov (DEN/DEC) 112, 9. Alexander Kristoff (NOR/UAE) 100, 10. Tadej Pogacar (SLO/UAE) 97
Polka-dot king of the mountains jersey:
1. Benoit Cosnefroy (FRA/ALM) 36 pts, 2. Pierre Rolland (FRA/VCC) 36, 3. Tadej Pogacar (SLO/UAE) 34, 4. Primoz Roglic (SLO/JUM) 33, 5. Nans Peters (FRA/ALM) 32, 6. Marc Hirschi (SUI/SUN) 31, 7. Lennard Kamna (GER/BOR) 27, 8. Jesus Herrada (ESP/COF) 25, 9. Quentin Pacher (FRA/VCC) 24, 10. Toms Skujins (LAT/TRE) 24
Under-25 white jersey:
1. Tadej Pogacar (SLO/UAE) 70hr 07min 27sec, 2. Enric Mas (ESP/MOV) at 2:35, 3. Egan Bernal (COL/INE) 18:24, 4. Valentin Madouas (FRA/FDJ) 1hr 20:34, 5. Daniel Martnez (COL/EF1) 1hr 23:51, 6. Lennard Kamna (GER/BOR) 1hr 31:26, 7. Harold Tejada (COL/AST) 1hr 43:48, 8. Neilson Powless (USA/EF1) 2hr 01:54, 9. Niklas Eg (DEN/TRE) 2hr 07:59, 10. Marc Hirschi (SUI/SUN) 2hr 14:34