Westwood and Schwartzel share lead in Sun City

The 38-year-old Westwood is currently third in the world rankings

England's Lee Westwood shares the lead with Masters champion Charl Schwartzel after round one of the Nedbank Golf Challenge in Sun City, South Africa.

Westwood and Schwartzel carded four-under-par 68s to finish the day one shot clear of Sweden's Robert Karlsson.

World number one Luke Donald is two under, along with fellow Englishman Simon Dyson, Northern Ireland's Graeme McDowell and Germany's Martin Kaymer.

Open champion Darren Clarke is bottom of the 12-man field after a 74.