On one of my "observatory" selection processes, it keeps count of each race that passed through filters: bet_race_wait_for_results type of real time process, but set to test bets. ( not yet satisfied with strike rate/Loss streak and drawn-down)

No matter how I set the filters, no matter how I set the Min or Max Fav. to pass on to the next part of a selection process to determine if it is a bet_race, No matter if it's greys or horse races,

after 7954 races processed, (Greys included, I don't do Trotts on this particular method), there were 2703 Wins where the First Favorite won.

2703/7954
33.98 % for 1st

22.28 % for first fav to come 2nd
15.60 % for "" "" "" 3rd

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On same selection method, older than the one above which uses less refinements.
2463/8009
30.75% for 1st

20.85% for first fav to come 2nd
16.59% "" "" "" 3rd

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Suggestions and Opinions most welcomed.