LONDON - Padraig Harrington, a late replacement in the four-man field for this week’s PGA Grand Slam of Golf in Bermuda, is banking on third time lucky after twice being beaten in a playoff at the elite, end-of-season event.Irishman Harrington accepted an invitation to compete at Port Royal Golf Course in Southampton after British Open champion Ernie Els withdrew on Saturday with an ankle injury."Hopefully this is third time a charm,” triple major winner Harrington told reporters on Monday while preparing for Tuesday’s opening round in the 36-hole event."I’ve come close twice in Grand Slams and hopefully it will be that close coming down the stretch this week and it would fall in my favour.”Harrington lost to Argentina’s Angel Cabrera in a playoff for the 2007 title and was edged out by American Jim Furyk in 2008 at the event which traditionally brings together the winners of the year’s four majors.Before getting his late call-up for Bermuda, Harrington had initially planned to compete in this week’s European Tour event, the BMW Masters at Lake Malaren Golf Club in Shanghai.Harrington accepted his invitation after the second and third alternates, Graeme McDowell and Tiger Woods, both said they were unavailable.The Irishman will be competing against Americans Bubba Watson, who won this year’s Masters, Webb Simpson (U.S. Open) and defending champion Keegan Bradley over the next two days.Bradley, winner of last year’s PGA Championship, gained his spot in the field as the first alternate after Northern Ireland’s Rory McIlroy pulled out due to a scheduling conflict.The Grand Slam of Golf, billed as "the most exclusive tournament in golf”, was held in Hawaii from 1991 to 2006 before moving to Bermuda in 2007.