Former Top 10 singles player celebrates doubles success.
A century of tennis for Gardnar Mulloy
Graphene technology puts new line of HEAD racquets at the top of the industry.
The Aussie sank from 9th to 18th in 2013.
Positive test came at Bank of the West tournament in July.
No Top 10 player ends 2013 in same spot he began it.
Russian transitions from tennis player to model to student to actress.
