Race 1 has the highest SR of approx 36% but worst ROI due to its very low prices.

Race 8 has the lowest SR of 24%

But it is also the race that nearly breaks even instead of losing like the other do,

due to its higher than average price offered.

You could make good money laying all <=2.00 favs in race No.1
Their SR is lower than the average of winning. in those races

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Cheers.