The 35-year-old American served up 10 aces and thumped 25 winners over 75 minutes on Rod Laver Arena to join sister Venus in the last four, where she will play 34-year-old Croatian Mirjana Lucic-Baroni
The opening game proved to be a nervous one for Pliskova, who produced a couple of early faults to give Kerber the chance to break, which the German eventually took when her Czech opponent fell prey to a broken string
After witnessing Serena Williams lose to Karolina Pliskova, Kerber was aware that victory over her Danish opponent would see her overtake the American in the standings but she showed little nerves on the Arthur Ashe Stadium court
Top-seed Williams came into the match as heavy favourite and had also won the last four meetings between the two without dropping a set, but the American made 20 unforced errors in a wobbly opening set
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27, Joseph Odunlami Street, off Thomas Salako Street, Ogba, Lagos.