Five-times champion Venus Williams and Andrea Petkovic had clocked up the so-called "double bagel" on the opening day of the tournament, against Americans Madison Brengle and Shelby Rogers respectively.
The unfortunate Witthoeft, ranked 53 in the world, had the chance to register on the scoreboard in the final game of the first round match but even then 10th seed Kerber ruthlessly slammed the door shut with a winner.
Two points later it was game over when 20-year-old Witthoeft, who according to the WTA notes models her game on 2004 Wimbledon champion Maria Sharapova, wafted a shot long.
(Reporting by Martyn Herman; editing by Justin Palmer)
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