Groups we're watching: Rd. 4, Stanford St. Jude

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All times are eastern.

Tim Clark, Trevor Immelman
Tee time: 1:35 p.m.
Tee: No. 1
Total TOUR wins: 2
Why you should watch: It is truly a small world. On a stretch of a few hundred acres in Tennessee, Tim Clark will be playing in the final group with fellow South African Trevor Immelman. Clark hasn't yet won on the PGA TOUR, but he's a tough player who does everything well. Immelman's appearance in the final group is a mild surprise -- he hasn't played well since his breakthrough win at the Masters in April.

Bill Haas, Alex Cejka
Tee time: 1:26 p.m.
Tee: No. 1
Total TOUR wins: 0
Why you should watch: You might not know it, but Haas is one of the longest hitters on the PGA TOUR. He's an outstanding ballstriker, but lackluster putting (134th in 2008) has held him back. Cejka is probably the wild card at the top of the leaderboard: he is always a threat to go low, and it would not be surprising if he shot 65 to snatch the win.

Padraig Harrington, Boo Weekley
Tee time: 12:50 p.m.
Tee: No. 1
Total TOUR wins: 5
Why you should watch: Since his win at the British Open last year, Harrington has geared his game towards the majors, and the Irishman is playing well ahead of Torrey Pines. Both Harrington and Weekley are expected to be contenders in the U.S. Open next week, and both have navigated the difficult TPC Southwind with steady play. Weekley went low in the first round (65) and could easily do it again.