While McIlroy searches for his best form, former Masters champion Schwartzel shrugged off a late double bogey on his way to a seven-under round which included 10 birdies.

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But he didn't make another birdie the rest of the way, and took a double bogey on the par-3 17th when his shot plugged into the bank short of the green and he never found the ball.

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He reached the turn on two under and shot four more birdies on the way home, but a double-bogey at the 13th denied him a better score.

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