April 15 (Reuters) - World number one Jason Day coped well with mental fatigue and gusting winds to stay on track for a seventh tournament win in just 14 starts as he moved joint top after the RBC Heritage second round in South Carolina on Friday.
The Australian stayed patient as he ground out a two-under 69 in cool, blustery conditions at the picturesque Harbour Town course on Hilton Head Island, ending the round level with Americans Kevin Chappell and Charley Hoffman, who both shot 68.
At six-under 136, they lead by one stroke from Scotland's Russell Knox, who fired a best-of-the-week 65, joint first-round leader Luke Donald, of England, and American Patton Kizzire.