Tennis legend Serena Williams has revealed the US women's soccer team have inspired her following their equal pay lawsuit.

The US team are in the process of suing the US Soccer Federation for gender discrimination.

And Williams has said that she admires US players such as Megan Rapinoe and Alex Morgan for using their voices to promote gender parity.

Speaking to Business Insider, the 23-time Grand Slam champion said: "They have really been champions and have been using their voices in the biggest of ways. They inspire me. 

"Those women are — oh my gosh — I admire them so much, and I look up to them so much. They encourage me to want to continue to fight, and that's what it's all about.

"I have to look at myself and say 'Am I doing enough? I always thought I did enough, but can I do more?' and I felt like I could."

However, despite the movement, Williams feels there is so much more to be done in the pursuit for equality.

"There's so many other things — equal playing time on show courts or conditions of locker rooms or treatments or facilities," she added.

"There's so many things; I could go on and on... It's good for anyone — it doesn't have to be me — to speak up and to take on this role because our voices need to be heard."