Get A Grip
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Bookies will offer the lowest payout that they can get away with for any given player.
If punters are willing to bet on Nadal at 6/1 then the bookies won't offer more.
In other words the odds are a reflection of market sentiment
I think the market has irrational expectations from Nadal. We can see an example of that in this thread, where some poster appears to be getting agitated at the facts and figures I have laid out.
Aren't the current odds on Nadal 9/2? I'm not a better, but I would put a little money (fun money) down on those odds.