15. Serena Williams
Williams is tennis’s leading lady, but she’s a lot more than that. A cultural icon, she has endured unbelievable hate and prejudice throughout her athletic career. Despite this, she has remained strong and defiant as she rose to become a superstar in every sense of the word.

She’s also a strong social critic. Williams tweeted Nike’s powerful ‘Don’t Do It’ video along with the message: “Don’t pretend there’s not a problem in America”. This isn’t the first time she has stood up for black rights as she regularly speaks out against abuses across the nation.