(Reuters) - Northern Irishman Graeme McDowell and Scotland's Russell Knox were in a share of the final-round lead in the OHL Classic at Mayakoba in Mexico on Sunday before play was suspended due to darkness. McDowell, chasing his first PGA Tour victory since April 2013, was six-under for the round after 13 holes at the El Camaleon Golf Club in Playa del Carmen while Knox, who won last week's WGC-HSBC Champions event, was six-under after 12 holes. More...