Cape Town - World No 4 Roger Federer is hoping to return to action at next year's Australian Open after an injury-hit 2016.Federer's last match was at Wimbledon in his semi-final loss to Milos Raonic after twice requiring treatment to an injured knee.The 34-year-old, who has never won an Olympic single's title, had to miss the Rio games and has ruled himself out of competing at the US Open - which starts on August 29 - and the rest of 2016.He has now set his sights on making his comeback at Melbourne Park in January next year."I'm working for the Australian Open," the Swiss said. "I'm doing well.""I never thought I'd have a year like this. I've learned a lot from this year," added the Swiss, who also missed the French Open earlier in the year with a back issue."It's painful being here in New York, and it was painful during the Olympics because I love competing. But you can't have it all."It was a tough decision to say the least - going out of Rio, the US Open, the (season-ending) World Tour Finals. But in some ways it ended up being a simple decision. Health is my number one thing."