Can't believe I remembered Willem but not the last name. Anyway, very nice quiz. I especially like the part where it took me a whole minute to remember the name of the tennis open held in Australia.
Can you change the 'Platypus' one? The clue isn't very helpful. And could you accept 'Down Under' as a type-in for the nickname? And, by the way, you've got the 'Akruba' wrong. It's actually 'Akubra'.