In an out-of-nowhere end to Martina Hingis' comeback, the

five-time Grand Slam champion revealed Thursday she tested positive

for cocaine at Wimbledon and will retire for a second time rather

than fight what she called a "horrendous" accusation.

"I am frustrated and angry," the 27-year-old Hingis said at a

news conference in Zurich, Switzerland, her voice breaking as she

fought back tears. "I believe that I am absolutely, 100 percent

innocent."

She read a prepared statement ending with the vow, "I have

never taken drugs," then left without taking questions.

WTA Tour chief executive Larry Scott said he recently found out

about Hingis' doping test from the player's representatives -- word

had not reached him through official channels because it's an

ongoing case in which a hearing has yet to be held.

Although the formerly No. 1-ranked Hingis said she's retiring in

part because she doesn't want to spend years dealing with the legal

process, Scott said he expects the case to continue.

"Like a lot of Martina's fans and friends and colleagues, [I

am] saddened," Scott said in a telephone interview. "She's a

great legend, one of the most well-liked players on the tour. But

at the same time, I'm ... also mindful that the player has to be

given the presumption of innocence until the process plays out

until the end."

Hingis tested positive June 29, the day she lost in straight

sets to Laura Granville of the United States in the third round at

Wimbledon. That was her first tournament after missing 1 1/2 months

with hip and back injuries.

"I just didn't want to miss Wimbledon," Hingis said at the

time. "Probably at the end of the day, it wasn't, like, the

smartest thing."