Australia's Bernard Tomic entertained a capacity Centre Court crowd at Wimbledon on Saturday but in the legendary venue's shadow out on Court 15, his younger sister Sara took some early steps in her quest to eclipse him.

Aged 15, Sara Tomic made her Wimbledon debut in the girls' singles, but was the first player knocked out of the juniors, losing 6-1, 6-0 to Estonia's 13th seed Anett Kontaveit.

However, she has set her sights on making sure she is the most famous tennis player in the family.

"I always looked up to him when I was young," Tomic told AFP.

"I hope to be better than him one day, certainly. He gives me a lot of advice.

"It's different when you have a brother like that, someone at the top level and I hope that I can learn from him in each and every way, every day.

"I'm definitely grateful and I wouldn't change anything. I'm so happy with all the things I've got just from being his sister. But I want to be my own person and hopefully one day I can."

Though she can see similarities with her brother's playing style, Sara Tomic is modelling herself more on world number one Serena Williams.

"We have the same backhand for sure. We grew up with the same coach so we do have similar technique but I'm more of a power player. The reason why I want to go professional is because of Serena."

She wears one of the Wimbledon champion's custom-made jackets and said she "started crying" when she received it.

"She's such a killer on the court. I'm having problems with it. I hope can turn things around and try and be a killer on the court, an attack player. So far I'm not at that point where it's good enough.

"I want to be number one but there are so many things I need to work on."

The 57-ranked junior is in London for the first time and is enjoying her debut Wimbledon experience.

"Even just walking around was special, seeing all the people, kids, fans waiting for all the top players. I hope I can be there one day and I really feel this is where I want to be."

Unlike her brother, she is not coached by their father John Tomic, who faces a court date in Madrid later this year over an alleged attack on his son's former hitting partner Thomas Drouet.

"My dad coaches me now and then, but Bernard is his number one priority. I have my own coach," said Sara.

He has been banned from entering the Wimbledon grounds, either as a coach or a spectator, much to 20-year-old Bernard Tomic's annoyance.

However, Sara Tomic was able to be in his corner on Centre Court to cheer him on as the world number 59 downed French ninth seed Richard Gasquet.

"I was happy to see my sister supporting me in my box. It's a very good thing," said Bernard after reaching the last 16.

He intends to repay the compliment.

"She's feeling her ankle. She couldn't really move. I didn't talk a lot with her. I think I'll go to dinner with her and have a chat with her.

"She's playing doubles as well. If I had the time to go see her, I'd love to."