The athletics kicks off on Friday, with the first gold medal event the men's 10,000m.
It's the first time in over a decade that Mo Farah has not been on the start line, but that doesn't mean GB is without representation.
In fact, two Brits will race in the final hoping to carry on Sir Mo's legacy.
Here's everything you need to know ahead of the final...
What time is the 10,000m final in the UK today?
The men's 10,000m final will take place at 20:30pm in Tokyo and 12:30pm in the UK.
Tokyo is 8 hours ahead of the UK, meaning fans have had to get up very early to catch events like the swimming.
Fortunately for athletics fans, much of the finals action will take place during the evening sessions in Tokyo, meaning spectators won't have to get up in the middle of the night.
Who is representing Team GB?
Sam Atkin and Marc Scott will race for Team GB in the men's 10,000m final.
They are ranked 82nd and 24th in the world respectively, with personal bests of 27:26:58 and 27:10:41.
No one is ever out of contention in sport, but both GB boys would need to lay down the best performance of their lives so far to be in with a shot of the medals.
Among the favourites is world record holder Joshua Cheptegei, who, if he can match his sweltering pace of 26:11:00, will be hard to beat.
The fastest time in the world this year was recorded by Jacob Kiplimo at 26:33:93, who will also have a crack at the gold.
However, without defending champion and seasoned Olympic professional Sir Mo in the mix, the competition is wide open and should prove to be a very exciting race.
Why is Mo Farah not competing?
Unfortunately Mo Farah missed out on Olympic selection after failing to achieve the qualification time.
The 38-year-old was keen to confirm this was not the end of his career however, and holds the firm belief he still has something to give.
Speaking to TalkSport earlier this year, he said: "At the moment in my career, I feel like I'm not finished yet.
"I know I can do it and I will not end it like this. I want to end it with something massive. Although obviously nothing is going to be as big as the Olympics, I want to come back out and do something great.
"That's what makes us champions. You have to continue, you have to go over many hurdles and you have to push on.
"At the moment, it's tough, but I will continue. You'll see that smile again."
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