10. United States of America vs. Sergio Garcia
It began in earnest at the 2002 U.S. Open at Bethpage, where Garcia's endless waggling and complaints about playing in the rain drew taunts of "Waggle Boy!" and "Whiner!" from the vociferous galleries. Garcia responded with a flip of his middle finger. Five years later he upset fans by spitting in the cup at Doral, and his woe-is-me press conferences at the 2007 and '08 British Opens didn't help matters, either. But Garcia has most irked American fans at the Ryder Cup.