World No.2 Rory McIlroy to play first -ranked Hunter Mahan in World Match Play semifinals . The winner will depose Luke Donald at the top of the world rankings if they can also win the title . The U.S. will have a shot at the title for the third time since Lee Westwood won it in 2008 . Arizona Ryder Cup player Hunter Mahan will play compatriot Mark Wilson in the other semifinal in Arizona .
World No.2 Rory McIlroy to play third-ranked Lee Westwood in World Match Play semifinals . The winner will depose Luke Donald at the top of the world rankings if they can also win the title . The U.S. will have a shot at the title for the first time since Tiger Woods won it in 2008 . U.S. Ryder Cup player Hunter Mahan will play compatriot Mark Wilson in the other semifinal in Arizona .