Dinara Safina rips one claim about her back injury, very early retirement as 'stupid'

Dinara Safina didn't mince words when asked about the claims that her back injury was caused by "overtraining," ripping that notion as "stupid."Just a month after celebrating her 22nd birthday, the Russian made her maiden Grand Slam final at the 2008 French Open. In the next 12 months, she went on to make two more Major finals at the 2009 Australian Open and the 2009 French Open, as well as reach the world No. 1 ranking position. But then, Safina's promising start to a career was halted by