Now Wimbledon is going on for over a week, I wonder why some players enter mutliple events on the same Grand Slam, e.g. the Williams sisters that in the past participated in the Women's Singles and Doubles. There are plenty of players that start in the Single or (midex) Double.
My question is why do tennis-players do this?
I can imagine that playing in multiple events is exhausting if you survive a few rounds, and playing in the doubles does negatively affect once performance in the singles. On the other hand they might earn more money, or don't expect to get far in either of the events, but that does not hold for the Williams sisters.