Swimming sensation Kaylee McKeown is aiming to defend one of the two Olympic backstroke titles she claimed three years ago, while the Australian men’s 4x200 freestyle relay team hope to go one better than in the two-lap race earlier in Paris.

Jessica Fox has already secured one gold medal at the 2024 Games and will now chase a second while defending her Olympic crown in the women’s canoe single, as another reigning champion, Logan Martin, sets out to back up his Tokyo title in the BMX freestyle park.

Related: Paris 2024 Olympics: what you missed overnight in Australia on day three of the Games

Australia’s women’s rugby sevens team are through to the semi-finals and will be sure to win a medal if they get past Canada. The Boomers also take on Canada in men’s basketball, and the Kookaburras look to make it three-from-three when they face Belgium in men’s hockey.

But the men’s triathlon has been postponed due to concerns over pollution levels in the river Seine.

Here are the Australians to watch on day four at Paris 2024 – all times AEST:

3x3 basketball

• 2am: Women’s pool round: Australia Gangurrus v Canada

Badminton

• 10.50pm: Women’s doubles: Angela Yu and Setyana Mapasa v Tanisha Crasto and Ashwini Ponnappa

Basketball

• 9.30pm: Men’s – Group A: Australia Boomers v Canada

Beach volleyball

• 5pm: Men’s preliminary – Pool C: Thomas Hodges and Zachary Schubert v Michal Bryl and Bartosz Losiak

Boxing

• 7.32pm: Men’s 51kg prelims - round of 16: Yusuf Chothia v Rafael Lozano Serrano

• 12.18am: Men’s 80kg prelims - round of 16: Callum Peters v Nurbek Oralbay

• 1.06am: Women’s 54kg prelims - round of 16: Tiana Echegaray v Hatice Akbas

Canoe slalom

• 11pm, 1.10am: Women’s canoe single heats: Jessica Fox

• 12am, 2.10am: Men’s kayak single heats: Timothy Anderson

Related: Jess Fox delivers stunning final run to claim kayak gold at Paris Olympics

Cycling BMX freestyle

• 9.25pm: Women’s park qualification: Natalya Diehm

• 11.11pm: Men’s park qualification: Logan Martin

Hockey

• 3.45am: Men’s – Pool B: Australia Kookaburras v Belgium

Judo

• 6pm: Women’s -63kg elimination round of 32: Katharina Haecker v Lucy Renshall

Rowing

• 5.30pm: Women’s single sculls quarter-finals: Tara Rigney

• 6.50pm: Women’s double sculls semi-finals: Amanda Bateman and Harriet Hudson

• 7.30pm Women’s four repechages: Olympia Aldersey, Jean Mitchell, Lily Alton and Molly Goodman

Rugby sevens

• 12am: Women’s semi-final: Australia v Canada

Related: ‘A significant moment for rugby’: women’s Olympic sevens draws bumper Paris crowds | Jack Snape

Sailing

• 8.05pm: Women’s skiff: Olivia Price and Evie Haseldine

• 8.13pm: Men’s windsurfing: Grae Morris

• 10.35am: Men’s skiff: Jim Colley and Shaun Connor

Shooting

• 5pm: Men’s trap qualification: James Willett, Mitchell Iles

• 5pm: Women’s trap qualification: Catherine Skinner, Penny Smith

Surfing

• 3am: Men’s quarter-finals: Ethan Ewing v Jack Robinson

Related: Jack Robinson barrels into last 16 of Olympic surfing event in Tahiti as Molly Picklum exits

Swimming

• 7pm: Men’s 200m butterfly heats: Matthew Temple

• 7.15pm: Men’s 100m freestyle heats: Kyle Chalmers, William Yang

• 7.44pm: Women’s 1500m freestyle heats: Lani Pallister, Moesha Johnson

• 8.39pm: Women’s 100m freestyle heats: Mollie O’Callaghan, Shayna Jack

• 8.51pm: Men’s 200m breaststroke heats: Zac Stubblety-Cook, Joshua Yong

• 9.08pm: Men’s 4x200m freestyle relay heats: Australia

• 4.30am Men’s 100m freestyle semi-finals: Kyle Chalmers, William Yang (TBC)

• 4.42am: Men’s 200m butterfly semi-finals: Matthew Temple (TBC)

• 4.56am: Women’s 100m backstroke final: Kaylee McKeown, Iona Anderson

• 5.02am: Men’s 800m freestyle final: Elijah Winnington

• 5.25am: Women’s 100m freestyle semi-finals: Mollie O’Callaghan, Shayna Jack (TBC)

• 5.47am: Men’s 200m breaststroke semi-finals: Zac Stubblety-Cook, Joshua Yong (TBC)

• 6.01am: Men’s 4x200m freestyle relay final: Australia (TBC)

Related: Mollie O’Callaghan dethrones Ariarne Titmus in epic Olympic showdown

Tennis

• 8pm: Men’s singles second round: Alexei Popyrin v Stan Wawrinka

• 9.30pm: Women’s doubles first round: Ajla Tomljanovic and Olivia Gadecki v Mirra Andreeva and Diana Shnaider

• 9.30pm: Mixed doubles first round: Matthew Ebden and John Peers v Pablo Carreno Busta and Marcel Granollers

Triathlon

The men’s individual triathlon has been postponed due to pollution in the river Seine still being too high for athletes to safely swim in.

Water polo

• 6.30pm: Men’s preliminary round – Group B: Australia Sharks v Serbia