Padraig Harrington in contention at Charles Schwab Cup Championship

Padraig Harrington is one shot off leader Steven Alker going into Saturday's third round at the Charles Schwab Cup Championship.

Harrington, who currently sits on 12-under-par, carded a seven-under 64 in Friday's second round at the Phoenix Country Club.

To win the Charles Schwab Cup and the $1 million bonus, Harrington has to win this week's tournament and hope New Zealander Alker finishes outside the top five.

The two-time British Open champion tees off at 7.55pm (Irish time) today.