Ireland's Padraig Harrington fired a five-under par 66 on Tuesday to seize a two-stroke lead over Masters champion Bubba Watson after the opening round of the PGA Grand Slam of Golf.

The four-man, 36

An ankle injury has forced South African Ernie Els out of this week's Grand Slam of Golf and will be replaced by 41-year-old Irishman Padraig Harrington, who has twice played in the tournament here.