Three of Five

The Economist calls for women's tennis to adopt 3 sets of 5 as a standard match:

In itself, the shorter format demeans women. It gives ammunition to opponents of equal pay, who argue that women put in fewer hours and attract less interest than men. And the discrimination is unusually sexist. While most of the twentieth-century Olympic Games did not include women’s distance-running events because of similar old-fashioned prejudice, amends were made in the 1980s. Since then, women have competed in events as gruelling as the marathon with no ill effects. In tennis, meanwhile, the influence of the Victorian mindset is still apparent.

I agree.