Owen Hargreaves broke the deadlock in the 15th minute, before a late double from Claudio Pizarro secured a flattering scoreline for the Bundesliga leaders at the intimidating Millerntor-Stadion.
Kahn told PA Sport: "Hats off to St Pauli, a loss would not have been an embarrassment for us. You could not see a difference between the two teams at certain times."
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