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, 14:00): stripping bookmaker margin out of 1 price feeds gives Madison Keys 74% against 26% for Katerina Siniakova.

Fair odds on Madison Keys sit at 1.35; the best available price is 1.29 at Betway; Katerina Siniakova pays up to 3.75 at Betway. Average margin on this match is 4.2% — anything above fair value is worth taking, anything below it is paying the bookmaker's spread.