The 2012 PGA Championship in South Carolina has been anything but predictable. Joost Luiten single-handedly delayed the start of the third round and now weather will delay the start of the fourth. As Sunday's final day is preparing to get underway in the tournament, the weather-delayed third round will need to wrap up before the fourth and final round can begin.

As the golfers tee off in the middle of the third round on Sunday, the leaders will be Rory McIlroy and Vijay Singh, who are both at 6-under and hold a one-stroke lead over Adam Scott.

The players are expected to be back out on the course at 4:45 a.m. PT -- weather permitting -- and will finish up their round. The fourth round is expected to begin at 8:30 a.m. PT.

The fourth round (and probably part of the third round) of the PGA Championship airs Sunday from 5 a.m. - 11 a.m. PT on TNT, then will switch over to CBS for coverage from 11 a.m. PT until the end of the day, however long that may take. You will be able to stream par-3 holes and cover marquee pairings live online at PGA.com. There is also a free PGA Championship app for mobile devices that will feature live video and leaderboard updates.

For a live leaderboard, head over to Golf.com.

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