Tiger Woods faces threats to world number one ranking

Tiger Woods will face two challenges to his world number one ranking when he defends his WGC-Bridgestone Invitational in Ohio tomorrow.



Phil Mickelson will depose him with a win, or a top-four finish if Woods finish outside the top 37.



Lee Westwood, runner-up in two majors in 2010, would reach number one if he wins and Woods is outside the top two.



Westwood could also take top spot with a second place finish providing Woods finish outside the top 10 and Mickelson fails to win the title.



Woods has had five years in his current run as world number one but is yet to win this season in seven attempts after returning from a five-month absence following the much publicised revelations about his private life.