Sentence:  Darren Clarke's impressive victory on Sunday at Montecastillo in the Volvo Masters, the season's finale, was good enough to leapfrog Lee Westwood into second place on the order of merit, but not to dislodge Monty as the <WSD>king of the castle</WSD>. 
Meaning of the word marked with <WSD> tags:  An individual who assumes a position of greater importance, authority, or prominence than others.