LONDON (AFP) -- Former world number one Martina Hingis will fight her positive drugs test, her manager confirmed on Wednesday.

Hingis, 27, announced her retirement on November 1 after admitting she was under investigation for a positive test for cocaine. She indicated at the time however that she would not be challenging the result.
But her manager Mario Widmer told BBC Sport: ""She will be fighting this, of course. You can be clear about that. The matter is currently with her lawyers.""
Hingis revealed she had returned a positive result for cocaine from a routine urine sample taken at this year's Wimbledon after losing in the third round.
She insisted she was ""100 percent innocent"" and that this was backed up by a negative result on a hair test, which can show whether or not someone has taken cocaine.
It is the second time that Hingis, one of the teenaged stars of the game in the 1990s, has retired from the professional circuit.
The Swiss star, who has five Grand Slams to her name, first retired in 2003 due to persistent ankle injury problems, but returned to the circuit in 2006.