Thompson, Farah light up the track

Elaine Thompson continued Jamaica's dominance in sprint by winning the women's 100m gold medal with a time of 10.71 seconds on Saturday, beating two-time defending champion and compatriot Shelly-Ann Fraser-Pryce to third place.

The 24-year-old finished 0.12 seconds ahead of America's Tori Bowie with Fraser-Pryce settling for bronze at 10.86sec.

Fraser-Pryce ran a confident first 50m of the final but faded as Thompson powered through the second half of the race to win in 10.71 seconds. Thompson confessed that she surprised herself by winning the most coveted title in women's sprint.

"When I crossed the line and glanced across to see I was clear [I] didn't quite know how to celebrate," she told reporters.

Fraser-Pryce, who was looking for a third consecutive title, said she was happy that the sprint title was staying in Jamaica. "What I'm most happy about is that the 100m title is staying in Jamaica. I'm on the podium with my training partner. I'm proud of Jamaica."

The day's other marquee event saw Mo Farah retain his 10,000m crown after a dramatic fall early in his race. The 33-year-old produced a magnificent final lap to become the first British runner to win three Olympic titles.

With 16 laps to go, Farah was accidentally tripped by America's Galen Rupp but he picked himself up and surged through the field to claim victory in 27min 5.17 seconds.

"At one moment I was thinking my race is over, my dream is over. I managed to dig deep. I promised my little daughter Rihanna a medal, my mind was on that. 'You can't let her down, you can't let her down'," an emotional Farah later told reporters.

Phelps takes one last dive to glory

Michael Phelps brought an end to his illustrious career with a 23rd gold medal -- his fifth of these Games -- after anchoring his 4X100m medley relay team as the swimming competition was wrapped up on Saturday night amid USA's absolute dominance.

Putting the perfect end to a career which spanned five Olympics and brought 28 medals, Phelps produced a blistering leg of butterfly to restore his team's lead after USA had fallen off the pace.

The 31-year-old Baltimore native was visibly overwhelmed with emotion as he let the applause from the crowd sink in, with his family members in tears.

"Getting off the bus and walking to the pool tonight, I pretty much felt myself starting to crack," Phelps later said regarding his decision to retire from the pool at the end of these Games.

"Last warm-up, last time putting on a suit, last time walking out in front of people, representing my country -- it's insane, a lot better than it was four years ago," added Phelps.

Phelps's five gold medals helped USA top the tally with 16 gold, with nearest competitors Australia and Hungary grabbing only three golds each. The men's 4X100m medley relay brought USA its 1001st gold medal in its Olympic history following the 1000th won by the women's rally team some 15 minutes earlier.

"This is how I wanted to finish my career. I've lived a dream come true. Being able to cap it off with these Games is just the perfect way to finish," Phelps said.

However, the American star had said similar things after the London Olympics too, only to return two years later. This time he said he had 'unfinished business' -- avenging his loss against South Africa's Chad le Clos in his favourite 200m butterfly. He did win the event this time, but he lost another of his favourites, the 100m butterfly, to young Singaporean Joseph Schooling.

Who knows, this defeat is what might egg him back from retirement once again. The fans worldwide would really love it because without Phelps, swimming will never be the same again.