Now before you say it is an Oblate Spheroid, it is, looking from afar, predominately round.
Why? Why are all large Planets round?
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to stop us falling off at the edges??
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So Lister can play pool with the planets.(obscure Red Dwarf reference,sorry)
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Immediate chortle escaped my lips reading this. 
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Because Life is a Ball!!
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Centrifugal (rotational) forces.
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Gravity. A planet’s gravity pulls equally from all sides. Gravity pulls from the centre to the edges. This makes the overall shape of a planet a sphere, which is a three-dimensional circle.
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Cos it was the cheapest shape to make when contracts were being put out ?? 
Ya gotta keep in mind that some of those Martians are damned stingy. 
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Because it’s flat really but MSM don’t encourage free thinkers.
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It keeps Australia at the bottom.
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I suppose it’s had all its corners knocked off
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That sounds like my old boarding school. Intake as rough as a badgers arse 
Output = refined and fine young gentlemen ready for gentile young ladies fresh from finishing school – yeah, right 
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To save galaxy space
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Well Terry Pratchett has a writers license to embellish.
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well well well said rupert bear leaning against a forest tree - “why are all trees in the forest straight up and down and did you know they can talk to each other through their roots - yea conversations all day long apparently - and why are ponds round but lakes long - and why and why oh dear Poo bear I am beginning to feel sleepy and its only breakfast time in oz?”
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The world is football shaped
For me to kick in space…
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