Padraig Harrington fired a nine-under-par 62 to take command of the season-ending Charles Schwab Cup Championship in Phoenix.
The Dubliner holds a five-shot-lead at 21-under-par over Australian Steven Alker, with the pair also battling for the season-long title of the Charles Schwab Cup.
Alker led the Charles Schwab Cup by over 600,000 points heading into this week's final event, meaning a top-five finish will see him win the season-long trophy even if Harrington wins this weekend.