Schwartzel, Madsen atop leaderboard
Defending champion Schwartzel shot a second straight 4-under 68 on Friday to join Madsen on 8-under 136 at Leopard Creek in northern South Africa.
Denmark's Madsen added a 71 to his opening-round 65 to stay on course for a second straight title. He overtook Schwartzel to win the South African Open on Sunday, the opening event on the tour's 2014 Race to Dubai.
John Daly looked set to miss the cut in his second tournament back from elbow surgery after a 3-over 75.
Copyright 2013 by The Associated Press
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