CBS Sports says Rory McIlroy's one-shot victory over Phil Mickelson in the PGA Championship produced the highest overnight ratings in five years.

CBS says the household rating was 6.0 with a 13 share, up 36 percent from a year ago when Jason Dufner beat Jim Furyk at Oak Hill, meaning probably more than 6 million people watched on Sunday. It was the highest rating since a 7.5 and 17 share in 2009 when Y.E. Yang rallied from two shots behind to beat Tiger Woods at Hazeltine.

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Sunday at Valhalla featured four players with at least part of the lead on the back nine -- McIlroy, Mickelson, Rickie Fowler and Henrik Stenson. The round finished at 8:43 p.m. EDT because of a rain delay earlier Sunday, and McIlroy finished in the dark.

McIlroy has won the last two major championships.