Originally posted on FOX Sports  |  Last updated 3/7/13

CHARLOTTE, NC - MAY 02: Rory McIlroy of Northern Ireland tee's off at the 13th during the final round of the Quail Hollow Championship at Quail Hollow Country Club on May 2, 2010 in Charlotte, North Carolina. (Photo by Richard Heathcote/Getty Images)
The second World Golf Championship of the year started Thursday at Doral's TPC Blue Monster. Here are 5 Things you need to know about the Cadillac Championship: 1. MCILROY'S MEA CULPA: Rory McIlroy made his first public appearance since walking off midway through his second round at the Honda Classic. The 23-year-old World No. 1 admitted that walking off the course was a mistake, one caused by both an aching tooth and a bruised ego. "I realized pretty quickly that it wasn't the right thing to do," he said. "No matter how bad I was playing, I should have stayed out there." McIlroy said his lower right wisdom tooth has been causing him pain for more than a year and that he wore braces for six months in 2012 to relieve some of the pressure in his mouth. "My tooth was bothering me, but it wasn't bothering me enough to ... quit," he said. McIlroy also said that he's felt pressure to live up to the expectations that have come with his on-course success. "I've been working really hard...
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