From Slashdot:

Many US and Canadian ISPs thought they were under a massive denial of service attack yesterday — traffic spiked by hundreds of gigabits across North America. Turns out that the traffic was due to live streaming of the U.S. Open and Tiger Woods nail-biting victory.

I also read that trading was down 15% on Wallstreet, and the theory is that it was because of [[Tiger]]. He is now the omnisportnetmarket controller! 🙂