Groups we're watching: Shell Houston Open, Round 4

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All times are central.

Chad Campbell, Johnson Wagner
Tee time: 12:45 p.m. CT
Tee: No. 1
Total TOUR wins: 4
Why you should watch: Chad Campbell is a proven winner on the PGA TOUR, while Johnson Wagner is still looking for his first. Both players are from the Lone Star State. What makes their pairing so compelling on Sunday is the fact that neither player is exempt for next week's Masters. The only way either of them can join the field at Augusta National is with a win at the Shell Houston Open. Along with his one-shot lead over Campbell, Wagner will bring some confidence into the final round on the strength of his tie for ninth finish at Redstone in 2007.

Bob Estes, Charley Hoffman
Tee time: 12:36 p.m. CT
Tee: No. 1
Total TOUR wins: 5
Why you should watch: Bob Estes hasn't been in the winner's circle since the 2002 Kemper Insurance Open. Estes, also a Texan like Campbell and Wagner ahead of him, needs a win on Sunday to join the field at Augusta National for the Masters. Estes made a big move on Saturday with an 8-under-par 64 and it'll be interesting to see if he can keep it going on Sunday. Charley Hoffman has himself in position to win for the second time in his career after a 3-under-par 69 on Saturday got him to 12 under. Both players will begin the final round trailing Wagner by three shots.

Geoff Ogilvy, Mathew Goggin
Tee time: 12:27 p.m. CT
Tee: No. 1
Total TOUR wins: 4
Why you should watch: The Aussie duo of Geoff Ogilvy and Mathew Goggin will start the final round five and six shots behind Wagner, respectively. Ogilvy is a dangerous player lately, as he proved at Doral a couple of weeks ago when he denied Tiger Woods his sixth consecutive PGA TOUR win at the World Golf Championships-CA Championship. Goggin is looking for his first PGA TOUR win and a ticket to Augusta National. Both players will have to go exceptionally low to have a chance on Sunday.

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