At the 2003 Wimbledon Championships, Feeney, along with fellow Australian Chris Guccione, made the final of the Boys' Doubles.

They lost the final to the Romanian pairing of Horia Tecău and Boys' Singles champion Florin Mergea.

In September 2006, Feeney won the Australia F9 tournament, winning the final against Miles Armstrong.

In July 2007, Feeney won the Great Britain F13 tournament, defeating Daniel King-Turner in the final.

He has also had victories over Horacio Zeballos, Karol Beck, Grigor Dimitrov, Kristian Pless, Mikhail Kukushkin and Dominik Hrbatý.