SCOTTSDALE, Ariz. — Vijay Singh withdrew from the Phoenix Open on Thursday, a day after saying he used deer-antler spray and was ‘‘absolutely shocked’’ that it may contain a banned substance.
Singh cited a back injury in pulling out before the first round.
The 49-year-old Fijian revealed he used the spray in an interview with Sports Illustrated. The magazine said Singh paid one of the owners of Sports With Alternatives To Steroids $9,000 last November for the spray, hologram chips, and other products.
The company says its deer-antler substance contains a banned performance-enhancer connected to human growth hormone.
Singh said in a statement Wednesday that while he used deer-antler spray he was not aware he may have been violating the PGA Tour’s anti-doping policy.
‘‘In fact, when I first received the product, I reviewed the list of ingredients and did not see any prohibited substances,’’ he said. ‘‘I am absolutely shocked that deer-antler spray may contain a banned substance and am angry that I have put myself in this position. I have been in contact with the PGA Tour and am cooperating fully with their review of this matter.’’
PGA Tour spokesman Ty Votaw said the tour is ‘‘looking into the matter.’’
Doug Barron is the only player to be suspended under the tour’s anti-doping policy, missing part of 2009 and most of 2010. The one-year suspension was lifted in September 2010, and Barron was granted a therapeutic use exemption for low testosterone.