Just been looking at the stats for both finals; not a great deal of history between Williams and Muguruza, with the American leading 2-1 but, if the occasion doesn't get to her, the Spaniard can take the World No 1 to the wire @ 5/2.
Djoko and Fed are very closely matched, with Fed leading 20-19. It is 1-1 in Grand Slam finals but Djoko leads 9-5 in finals, overall, and has won all 3 games that have gone to 5 sets. I think this one could be another to go the distance @ 5/2.
Both those bets are with Willy Hill but wasn't able to double them up there, so have had to use my Ladbrokes account which only pays 8.75/1 for the double.