Vijay Singh withdraws from Phoenix Open

Vijay Singh
© PA Photos
Vijay Singh withdraws from this week's Phoenix Open with a back injury.

Fiji's Vijay Singh has withdrawn from the Phoenix Open with a back complaint.

Singh had reportedly been under investigation by PGA officials after he admitted to using a product that contained a banned substance.

The 49-year-old has revealed that he has been using "Deer Antler Spray", which contains a hormone that stimulates muscle growth.

If found guilty, the three-time Major winner could face a lengthy suspension from worldwide competition.

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