Katerina Siniakova vs Madison Keys

The market has already made up its mind on Katerina Siniakova v Madison Keys in the WTA Tour (Tue, 18 Aug, 10:00 pm): stripping bookmaker margin out of 2 price feeds gives Madison Keys 72% against 28% for Katerina Siniakova.

Fair odds on Madison Keys sit at 1.39; the best available price is 1.30 at Unibet; Katerina Siniakova pays up to 3.45 at Unibet. Average margin on this match is 6.1% — anything above fair value is worth taking, anything below it is paying the bookmaker's spread.