Bolt has been untouchable on the blue track at the Luzhniki stadium, winning the 100 last weekend and then becoming the first man to take three successive 200 metres titles.
There should also be a third medal for Jamaica's double world champion Shelly-Ann Fraser-Pryce in the women's relay although Olympic champions the US start as slight favourites, even minus Allyson Felix who tore her hamstring in the women's 200 final on Friday.
With the fans finally filling the stadium in numbers, the championships could end on a noisy high with Russia's Olympic gold medallist and defending champion Mariya Savinova and Ekaterina Poistogova in the women's 800 metres final.
The women's javelin, men's triple jump and men's 1,500 metres are the other medals left to be decided.
Key times on day nine (UK times)
13:00 Women's javelin final
14:15 Women's 4x100m relay heats
14:45 Men's triple jump final
14:50 Men's 4x100m relay heats
15:25 Men's 1500m final
15:50 Women's 800m final
16:10 Women's 4x100m relay final
16:40 Men's 4x100 metres relay final