Usain Bolt and Mo Farah have retired - it's officially the end of an era.
Bolt was denied the perfect ending in the 100 metres last weekend when he finished third behind Justin Gatlin and 21-year-old Christian Coleman.
Speaking after his final ever 100m race, the Jamaican lamented yet another poor start, saying: "The start, it's killing me.
"Normally, I would get it through the rounds and get better through the rounds, but it didn't come together, and that's what killed me.
"I knew if it didn't come together (I would struggle), but I felt that it was there so the fact I didn't get it, that's the reason I lost, but it's one of those things."
As for Farah, the 34-year-old won gold in the 10,000 metres last Saturday but was forced to settle for silver in the 5,000 metres in his own final ever race.
Farah, who lost to Muktar Edris, said: "I gave 110 per cent. I don't think there was anything more I could have done. They worked as a team. The better man won.
"It's amazing to serve my country and win medals for them. Anything is possible."
Following Farah's silver in the 5,000m, the onus was back on Bolt and the Jamaica track team to win the 4x100m relay.
Having lost the 100m the week previously, Bolt would have been hoping to bow out with one final gold medal.
But it wasn't meant to be. The 30-year-old pulled up with a hamstring injury on the home straight as Great Britain won gold, United States finished second and Japan claimed bronze.
It was a truly remarkable run from Great Britain, who ran 37.47 seconds to record the third fastest time in history and claim their first ever gold in 4x100m at the World Championships. Check out the race below.
BOLT PULLS UP IN LAST EVER RACE
So, no swan song for Bolt. The Jamaican was visibly distraught on the track, but his last race won't distract from the fact he's the greatest sprinter ever.
Thank you, GOAT.