Callaway investigated Phil Mickelson’s gambling habits before signing him to a massive endorsement deal in 2004, according to a report on PGATour.com.
Senior vice president for Callaway Larry Dorman said the company was aware that Mickelson enjoyed gambling and conducted an investigation to ensure he didn’t have any outstanding debts.
The investigation revealed Lefty had actually been turning a profit in Las Vegas after examining his betting patterns - a stat Vegas casinos keep.
The information was confirmed by Callaway’s head of investigations and a former head of counterintelligence for the U.S. Army.
Mickelson issued a statement Monday apologizing for his recent comments that suggested he might make "drastic changes" due to rising California and federal taxes.
Lefty has +1,800 odds at Sports Interaction to win this week’s Farmers Insurance Open outright.