Barcelona terror attack: Rafael Nadal shattered, Garbine Muguruza shocked

"Shattered by what has happened in Barcelona! All my support for the families affected and the city," Nadal tweeted.

Sixth-ranked Muguruza said, "I couldn't believe it. I have been so many times to that place, so many times. It's like a main street with a lot of shops and people, I was very surprised because you always hear what happened in Paris and in London, and you're, like, 'S***.' But now, I've been so many times to this place, it's like my home. And I feel, like, 'S***.' I've been there so many times. So it shocked me."