By Brian Wacker, PGATOUR.COM

HILTON HEAD ISLAND, S.C. -- So much for Friday the 13th being a bad omen, at least for Bob Estes.

Playing the 183-yard par-3 fourth at Harbour Town, Estes made the fourth hole-in-one of his career. He used a 6-iron and it was the 22nd ace on the PGA TOUR this season.

The other holes-in-one for Estes came in the 1991 Buick Classic, the 2002 FedEx St. Jude Classic and the 2007 AT&T Classic.

The ace was also the second to come out of his group. Thursday, Billy Mayfair made a hole-in-one with a 5-iron from 202 yards on the par-3 seventh hole. It was the sixth ace of Mayfair’s career with the others coming at the 1989 AT&T Pebble Beach National Pro-Am, 1992 BellSouth Classic, 2005 AT&T Pebble Beach National Pro-Am, 2007 Wyndham Championship and 2010 FedEx St. Jude Classic.

Since 1971, only nine players have more aces than Mayfair, led by Hal Sutton’s 10.