Mo Farah continued his long-distance domination by retaining his 10,000 metres title in dramatic circumstances to reign supreme in Rio.
The 33-year-old became the first British track and field athlete to win three Olympic gold medals, but he did it the hard way after falling to the track following a trip from training partner Galen Rupp.
He recovered to respond to the challenge laid down by Kenya's Paul Tanui, bursting past him down the home straight and crossing the line in 27 minutes 5.17 seconds.
Farah headed to Brazil on the back of running his fastest 5,000 metres since before the last Olympics and the quickest in the world this year at the London Anniversary Games. It was some parting statement.
"I'm in decent shape", he had said. He was not lying.
He said he was prepared for an army of Kenyans to try and crush his challenge in Rio. But then they have tried for four years to find his number. And still they cannot succeed.
Farah was content to sit at the back of the field, with the pace slow in the early stages before taking closer order.
Disaster nearly struck when he tumbled to the floor after tangling with Rupp, but he got up, gave his training partner the thumbs up, and got right back into the mix.
With 300 metres to go Tanui pressed the accelerator in a bid to neutralise the Briton's renowned finishing speed, but Farah was not done and powered past the Kenyan before holding on to win by 0.47secs.
There was however no repeat of 'Super Saturday' from four years in London as Belgium's Nafissatou Thiam won the Olympic heptathlon gold medal to deny defending champion Ennis-Hill.
The 21-year-old did just enough in a thrilling final 800 metres race that the Great Britain athlete won, but not in a sufficient time to claim gold.
After two days of see-saw competition, Thiam went into the final event with a lead of 142 points, which equated to around nine seconds.
Ennis's personal best before Rio was 9.47 seconds better than Thiam's and she ran hard from the front to finish well clear.
Thiam, however, dug deep to come in just over seven seconds behind, a second inside her personal best, and good enough to take gold.
Canada's Brianne Theisen-Eaton claimed bronze after a strong second day.
Thiam finished with a winning score of 6810, with Ennis-Hill recording 6775 ahead of Eaton with 6653.
