Former No. 1 puts focus on on-court training, reduces gym work-outs.
Former Australian Open semifinalist forced out of Sydney, Melbourne with foot injury.
The 22-year-old is determined to climb back up the rankings this year.
Contrite Djokovic admits that he made a mistake in the Doha final.
Bethanie Mattek-Sands rises to WTA doubles No. 1 after Brisbane title.
The 17-year-old will make her Aussie Open debut next week.
The secret to a big serve is not in the shoulder says Andy Roddick.
