Billy Horschel fires a third round 67 to tie the lead at Tour Championship . it was a big turning point as it tied me for the lead , '' McIlroy told Sky Sports . Northern Irishman on nine -under par alongside England 's Billy Horschel . Billy Horschel seven shots back on two under as 29-strong field chase $ 10m prize .
Billy Horschel fires a third round 67 to tie the lead at Tour Championship . Northern Irishman on nine -under par alongside England 's Billy Horschel . Billy Horschel seven shots back on two under as 29-strong field chase $ 10m prize .