Rory McIlroy and Justin Rose three off the lead in Texas

Rory McIlroy watches his tee shot on the second hole during the third round of the Charles Schwab Challenge tournament in Fort Worth, Texas. Pic: AP

Rory McIlroy hits out of a bunker at the 11th green during the third round of the Charles Schwab Challenge tournament in Fort Worth, Texas. Pic: AP

World number one Rory McIlroy slid down the leaderboard while England’s Justin Rose battled to hold his position through round three of the Charles Schwab Challenge in Texas.