Ashleigh Barty's coach Craig Tyzzer believes she's proved she boasts the game that can keep her on top of world for a significant amount of time.
Barty was officially crowned world No.1 on Monday at the Eastbourne International - the tournament where she kick-started her career in 2016 as an unranked qualifier.
Tyzzer has worked with Barty since her return from her self-enforced exile and helped oversee her rise to the top seed and favourite for Wimbledon next week.
The Melburnian was asked to help with the All England Club's 2011 junior champion by her former coach Jason Stoltenberg, after she decided to turn her back on cricket and return to tennis.
"When she approached me and said, 'I'm thinking of giving this another go', the look that she gave me I knew she was deadly serious about coming back," Tyzzer said.
"She went straight into a 12-week training block.
"She had done zero fitness in the time she was off.
"I said to her 'this will be the test to see if you want it because it will be solid, every day'.
"As soon as we were through that first week she was exhausted but I could see she was deadly serious."
Barty started to climb the rankings and in 2017 she broke into the top 100 for the first time, after her maiden tournament triumph in Kuala Lumpur.
Wins in Nottingham and Zhuhai in 2018 catapulted her into the top 20 before she announced herself as a top bracket player this year in a staggering four-month period.
It began in March on the hard courts of Miami with her first premier WTA tournament victory.
That was followed by her French Open success in June as she ended Australia's 46-year wait for a Roland Garros champion.
She then repeated that clay court form on the grass at Birmingham last week and Tyzzer said it proves she's the most versatile player in the women's game.
"I thought the US Open was the slam she would win first," he said.
"She had been performing really well on the hard courts ... and tends to play them a bit more.
"She won in Miami, the French Open and then last week (at Birmingham); it shows her game transfers to any surface."
Tyzzer said Barty's strong work ethic and constant push to be the best continually challenged him and her strength and conditioning coach, Englishman Mark Taylor.
"Credit to her, she has pushed herself a lot and deserves every bit of her success, he said.
"But just because you are No.1 or have won a slam you are not going to win every match you play.
"There are too many good girls out there now and Ash knows that's not realistic...
"We will just keep doing the same processes and if she plays her best she is capable of beating anybody, she is not scared of any of the girls."
© AAP 2019