Singh, 50, was replaced in the field by Andrew Svoboda. Singh told the Tour that he was having back issues.
Despite Singh’s admission that he used deer-antler spray, the World Anti-Doping Agency no longer considers the substance to be prohibited. The PGA Tour thus found that he was not in violation of the circuit’s anti-doping policy.
In his previous eight starts this season, Singh has posted just one top-25 finish, a T-20 at the Sony Open. He also withdrew, citing a bad back, prior to the Waste Management Phoenix Open, when news of his deer-antler spray use first surfaced.