Career
Earlier at the 2009 Australian Swimming Championships, Prosser alongside Townsing, Ryan Nolan and Justin Griggs set an Australian Championship record in the 4 × 100 metre freestyle relay with a 3:20.67. Prosser"s anchor leg was swum in 48.99. Five months later, the same Melbourne Vicentre quartet set an Australian All Comers record in the same event at the 2009 Australian Short Course Swimming Championships.
At the Pan Pacs, held in Irvine, California in August, Prosser finished 8th in the 50 metre freestyle and finished 9th in heats of the 100 metre freestyle.
At the in Delhi, Prosser finished 5th in 50 metre freestyle in 22.46 and when teamed up with Richardson, Magnussen and Tommaso Doctorate"Orsogna finished as the fastest qualifier for the final in the heats of the 4 × 100 metre freestyle relay in 3:15.18.