Vijay Singh has withdrawn from the Phoenix Open, a day after saying he used deer-antler spray. Singh cited a back injury in pulling out on Thursday before the first round.
The 49-year-old Fijian paid one of Sports With Alternatives To Steroids' owners $9,000 last November for the spray, hologram chips and other products, said Sports Illustrated. The deer-antler substance contains a banned performance-enhancer connected to human growth hormone.
Singh released a statement, saying: "While I have used deer-antler spray, at no time was I aware that it may contain a substance that is banned under the PGA Tour Anti-Doping Policy."
Meanwhile, in Wellington, New Zealand, former British Open winner Bob Charles said he used and advertised a banned deer-antler spray for more than 20 years without realising it contained a substance that violated golf's doping protocols.
Danish cyclist admits to doping
Copenhagen: Danish cyclist Michael Rasmussen, who quit the 2007 Tour de France when he was wearing the race leader's yellow jersey, admitted that he had used banned drugs between 1998-2010.
"I used doping products and methods from 1998 until 2010," Rasmussen said.
Dope amnesty can save cycling: Lance
Paris: Lance Armstrong has said that a truth and reconciliation commission is the only way for cycling to move on from its drug-addled past, warning that doing nothing would consign the sport to stagnation and decline.
The 41-year-old said, "It's (a commission) not the best way, it's the only way."