I look at photos of handshakes and I appear so much smaller than some," Kostyuk discusses the physique of female players

In an interview with Tennis365, Marta Kostyuk talked about the top female players and also the physical differences that can exist between some players, particularly with Aryna Sabalenka.

She explains: "We all have our own biological structure. Some have a higher testosterone level, others less. It's natural and it really helps. I feel smaller than them.

I try to figure out how to beat these players with my tennis skills, but I have to work harder to win points. I have to run much more than them to win points.

I can't gain 10 kg or grow 5 centimeters taller, so I have to give my all. Other players have advantages in other areas. That's just how I am. I look at the photos when we shake hands at the net and I appear so much smaller than some of my opponents.

It's part of the sport and it's a really fun challenge for me to face these players. There are many, many things I can do to improve myself, but they have an advantage over me.

Their confidence is simply different. I've played close matches against Aryna and you see how she handles break points. She doesn't care at all. She's confident in her ability to save them.

She hits a powerful serve and hits hard forehands. No doubt. She's world number one, she's played many finals and she has that confidence. It helps her not to doubt.

For me, it's not so easy to play without hesitation. It's an exciting sport and I enjoy the journey of trying to understand it.