The world No.1 wasted little energy on a brilliant performance, winning 6-1 6-3 on center court.
Her opponent, meanwhile, was playing in the first Grand Slam quarter-final of her career and only managed to settle into the game in the finals.
Barty took the first set with ease in just over 20 minutes and broke the serve early in the second set.
As the match seemed to be over, Tomljanovic broke Barty’s serve to give himself a moment of hope, but his compatriot quickly closed the door, immediately running away and signing the victory.
“Ajla (Tomljanovic) is an incredible competitor,” Barty said during her on-field interview after the victory.
“I played with her a lot, I trained with her, all the Australians at home are proud of her and it was (…) nice to share the court with her today.
“This is a dream come true. I know you hear this a lot, but it is my dream and I am extremely grateful to have the opportunity to experience what I love to do and this afternoon did no different. “
Barty aims to become the first women’s singles champion at Wimbledon since Evonne Goolagong won in 1980 and, despite her retirement from Roland Garros last month due to injury, she looks well placed to rise to the challenge this year. .
The 25-year-old’s only Grand Slam title arrived at Roland Garros in 2019, but, with many big names in the sport no longer featured in the draw, this year’s Wimbledon looks more like a chance than ever before. ‘add to his count.
Barty will face Angelique Kerber in the final four after the German comfortably beat Karolina Muchova 6-2 6-3 earlier on Tuesday.
“I love this game. She knows her way around this field and I know I have to play well to give myself a chance in this game,” Barty added.
Meanwhile, on Tuesday, Aryna Sabalenka beat Ons Jabeur to reach her first Grand Slam semi-final. Jabeur had become the first Arab woman to reach the quarter-finals at Wimbledon, but failed to make any more history after being beaten round 6-4 6-3 by Sabalenka.
Sabalenka will now face Karolína Pliskova for a place in the final, after the Czech also reached her first semi-final at Wimbledon after beating Viktorija Golubic.
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