LOS ANGELES: Russian Tennis star Maria Sharapova, the highest-paid woman in sports, said on Monday that she failed a drug test at the Australian Open due to a substance she has been taking for 10 years for health issues.The 28-year-old Sharapova,...[IMG]http://feeds.feedburner.com/~r/com/YEor/~4/VjKcw**BYh0[/IMG]