Ranges, Combinations, Equity - HELP
 

I have two opponents to the flop. Based on their preflop and flop actions so far, I conlude that player 1 has :

top pair, two pair, set, or a str8

I conclude that player 2 has a very wide range like :
over cards, flush draw, str8 draws, any pair, low pocket pair, or could be slowplaying a monster (two pair, set, str8).

I have top pair.
What is the best way to ESTIMATE how often I will win this hand (assuming both players go to the river)?