Karatantcheva was suspended from tennis for two years in 2006, after she tested positive for nandrolone at the 2005 French Open when she was 15.

WSJ: How to Build a Tennis Empire

These are strange times for the two most famous rivals in men's tennis.

WSJ: Paths Differ but Goals Same for Nadal, Federer

Caroline Wozniacki, once the No. 1 tennis player in the world, has been linked to McIlroy for nearly two years.

FORBES: The Masters: 'It's Not Just Fred Couples, It's Power Couples' (And Other Quotes Of The Week)

Gasquet, who has slipped to 23rd in the rankings, faces a two-year ban from tennis, but is hoping for leniency.

CNN: Gasquet suspended by Tennis Federation

If Andy produces the tennis he's capable of, we could be in for a sensational two weeks.

BBC: Andy Murray knows he can win Wimbledon - Tim Henman

That, for sure, is the most unwelcome trend in tennis, and one these two desperately want to reverse.

WSJ: Paths Differ but Goals Same for Nadal, Federer

Clijsters withdrew from Wimbledon with a foot injury and appears headed for a second retirement from tennis to return to her family in the next year or two.

FORBES: Maria Sharapova: Tennis's "It" Girl Once Again

An investigation was launched by men's tennis' governing body when Bohdan Ulihrach was given a two-year ban after testing positive for nandrolone.

BBC: SPORT | Tennis | Tennis drug tests questioned

On September 22, 2012, two of the greatest tennis players of all-time will square off in a match for the ages at The Greenbrier Champions Tennis Classic, when legends Pete Sampras and John McEnroe take to the court at the venerable Greenbrier resort in White Sulphur Springs, WV.

FORBES: Fantasy Tennis Match Is Real - Sampras Vs. McEnroe

Tennis complies with the World Anti-Doping Authority's code, which recommends a two-year ban for possession of prohibited substances.

CNN: U.S. player faces ban for importing HGH