Oosthuizen remains leader of the pack

South Africa's Louis Oosthuizen 

Flawless initially, then surprisingly frightful for a period in the middle of his third round, Louis Oosthuizen eventually finished with a flourish to retain his lead at the Open.

A birdie on the 16th was followed by carefully crafted pars on the closing holes for Oosthuizen who signed for an up-and-down 69, leaving him at the head of the field on 12-under.