Ariarne Titmus versus Katie Ledecky 3.0 headlines the action on day 8 of the Tokyo Olympics.
Ash Barty will also take to the court with John Peers as they fight for bronze, while the Boomers are hoping to continue their unbeaten start.
The Tokyo Olympics are broadcast in Australia on free-to-air TV on Channel Seven, as well as streaming platform 7Plus.
The ABC will be live blogging events every day of the Olympics.
Here are the events to watch on Saturday, July 31.
Swimming: Four more gold on offer
The swimming wraps up this weekend but not without another nine medal races.
Saturday will see the staging of Titmus vs Ledecky 3.0 when the two stars battle it out in the 800 metres freestyle at 11:46am AEST.
Australia's Kiah Melverton is also in the field of eight.
Kaylee McKeown is chasing more gold in the final of the 200m backstroke at 11:37am, and will be joined by Emily Seebohm.
Matthew Temple will be in the final of the 100m butterfly at 11:30am.
The last final of the day goes at 12:43pm with Australia qualifying fourth fastest in the mixed 4x100m medley relay.
Athletics: Women's 100m final and men's 100m heats
There will be three gold medals up for grabs on day two of the athletics program.
The first will be the men's discus at 9:15pm AEST featuring Australia's Matthew Denny, who had the third-best throw in his group on Friday.
The mixed 4x400 metres relay final is at 10:35pm, then the world's fastest women go head-to-head in the 100m final at 10:50pm.
Rohan Browning, the third-fastest Australian 100m sprinter of all-time, will be in the heats which start at 8:45pm.
Keep an eye out for Liz Clay too in the 100m hurdles, who has been in great form and goes up against one of the world's best in American Kendra Harrison at 11:53am.
There will also be Australians in a range of other events, including the men's 800m and women's discus.
Basketball: Boomers vs Germany
The Boomers won their first two games in reasonable style but will be keen to go up another notch in their final group match against Germany at 6:20pm AEST.
That's been made a whole lot harder though with starting centre Aron Baynes ruled out for the rest of the Olympics with a neck injury.
It means Jock Landale, who was outstanding against Italy, will need to carry a heavier load alongside fellow big man Duop Reath.
Tennis: Barty and Peers in bronze medal match
Ash Barty and John Peers went down in a nailbiting semi-final to the Russian Olympic Committee's Andrey Rublev and Anastasia Pavlyuchenkova on Friday to miss their chance at gold.
Instead they will play for bronze in the second match on court 1 at the Ariake Tennis Park after 4:00pm AEST.
BMX freestyle debuts
Another sport making its first Olympics appearance begins on Saturday.
If the drama of the BMX racing is anything to go by, then this will surely be an event to check out.
Natalya Diehm and Logan Martin will be representing Australia when the action begins at 11:10am AEST.
Hockey: Australia vs Argentina
The Hockeroos go into their final group match still undefeated.
The world's number one team takes on Argentina at 12:45pm AEST at the Oi Hockey Stadium.
Quarter-finals will then be played on Monday.
Mixed triathlon
A mixed triathlon relay has been included at Tokyo, with teams of two men and two women competing over a short course (300m swim, 6.8km ride, 2km run).
The race starts at 8:30am AEST.
Australia will be represented by Emma Jeffcoat and Ashleigh Gentle, and two of Jake Birtwhistle, Aaron Royle and Matthew Hauser.
What else is happening?
There will be plenty of Australians in action in the sailing, which begins at 1:05pm AEST, but they won't be in either of the two medal events on Saturday.
At the Asaka Shooting Range, Australians will feature in both the mixed team trap and the women's 50m rifle.
Taylor Worth is into the final 16 of the men's individual archery at 11:22am with the medal clashes from 5:30pm.
The golf has been delayed by bad weather but the third round is due to begin on Saturday morning, with Australia represented by Marc Leishman and Cameron Smith.
Smith is best placed of the two, seven shots off the pace.
The Australian men play Spain in the water polo at 12:30pm in their second-last group match.
After a promising start to their campaign, Australia's women's rugby sevens team slumped to two close losses and are now out of medal contention.
Instead they'll play off for 5th-8th against the Russian Olympic Committee at 11:00am.
Australian Harry Garside fights Namibia's Jonas Jonas at 7:37pm in the men's 57-63kg boxing category.
Australians will also be in the women's 3m springboard diving from 4:00pm, the equestrian from 9:30am and the men's trampoline gymnastics 4:00pm.
Tokyo drifting
By Cody Atkinson and Sean Lawson
The first Saturday at the Tokyo Olympics represents a high point for a certain type of event at the Olympic Games — the mixed event.
The day sees medals handed out in athletics, swimming, triathlon, tennis, shooting and judo for events where both male and female athletes compete together.
Tokyo has 18 mixed gender events, double the amount in Rio, and more than seen since 1980.
The new events have boosted the mixed share of events to five per cent of all events.
There are also a select number of open events at the Olympics, where athletes from any gender can compete freely.
Currently, this direct competition is limited to equestrian, but sailing and shooting have had open gender events in the past.
In 1992, Chinese shooter Zhang Shan won gold in the Skeet, racking up an Olympic record along the way.
By the time that the Atlanta Olympics were held, women were banned from the event and Zhang was forced to retire until a women's only event was reintroduced in Sydney.
Finally, for the first time in Tokyo, rowing events with a coxswain may use a cox of the opposite gender.
This meant that the first medals were won in women's rowing events by males, Kiwi Caleb Shepherd and China's Zhang Dechang, in the women's eight on Friday.
Adding those, a total of 20 events at Tokyo will feature both male and female competitors on the same field.
The alternative medal tally
When it comes to tallying the medals of mixed and open gender events, it's Germany who comes out on top.
Germany's dominance of equestrian events, especially the dressage events, has been strong over the years.
Their most famous rider, Isabell Werth, equalled a longstanding Olympic record during the week with her sixth gold medal in the same event with Germany's win in the Team dressage.
