Serena Williams speaks about Venus, a pressure-free 2015, and getting her roar on vs. her sister

There wasn't much of a hint this might happen – until Venus Williams took the court like a woman on a mission and Serena Williams had some trouble getting her legs to move.

In defeat, Serena said it was pretty simple: she didn't play well. Her sister did. And while she hopes to do well at the U.S. Open, it has been a disappointing year by her standards.

Here's some of what she had to say in her post-match press conference Saturday.