The data is loaded dynamically using AJAX. You cannot simply access it with an XPath expression without executing the JavaScript, for example using Selenium.
But using Firebug/Chrome Dev Tools and monitoring the "Network" tab, you can try to find out which URL is requested. I think you're looking for
http://www.pgatour.com/data/players/24502/2014results.json
which returns the table content as easily to parse JSON objects.