Much has been said recently about the womens game and how they deserve to receive the same (or similar) financial rewards as the men, but the quality and standard of the womens game is so poor in comparison.
Serena has just annihilated her semi-final opponent, and despite Venus clearly struggling with her health issues, she has just narrowly been defeated in her semi. Serena will simply destroy Kerber in the final, and the difference in quality between her and the rest of the players is like night and day.
You've got to give credit for to these athletes for being at the top of their game in this sport, but to demand equal financial rewards when their game is so far behind in all aspects of the game is almost as ridiculous as the USA womans football team claiming the same (albeit the women footballers probably have a stronger argument given how young the game is in general over there and what they achieved at their World Cup).