Sienna Opray and Madeleine Wilson faced off on opposites sides of the net in the Warrnambool Grasscourt Open's 16 and under final.
But just under five hours after Opray claimed the win, the pair teamed up to take out the AMT women's doubles final.
There was no bad blood from their first encounter though - they are best friends after all.
"We do everything together," Opray said.
"We go to Wesley College in Melbourne, and Sienna started in year eight so ever since then," Wilson said.
Opray and Wilson, both 16, play together in Wesley's first tennis team for the Associated Public Schools sports competition.
They are undefeated in doubles - a feat they extended on Thursday.
Entering the competition as the number one seeded 16 and under and women's players, Opray said she was surprised to see she herself at the top of the draw.
Though she lost her women's semi final in a tough three-setter, it was a tag that stood up in 16 and under fixture, Opray dropping just 10 games on her way to a 6-2, 6-2 final win over Wilson.
Despite it being smooth sailing throughout, Opray said her wins were by no means a given.
"It may look like I've easily gone through, but they've all been pretty tough matches," she said.
Opray describes herself as an aggressive baseliner-slash-all courter.
"I really like the grass courts because I love to serve and volley and finish at the net," she said.
"Just that playing style suits me, slicing, and mixing it up."
Wilson said Opray's serve was "on fire" in the junior final.
"She was really consistent and hitting it high, heavy and hard," she said.
"She came to the nets and finished the points."
Wilson had hoped to be more consistent on Thursday morning, but overall was happy with her form throughout the week.
"I think this week my serve's been really good; I don't think there was anything in particular I was really needing to improve," she said.
The top-seeded doubles pair enjoyed shared success in the women's final, defeating Summer Jones and Hamilton player Willow Sainsbury, 6-3, 6-2.
"We love volleying, so we try and get that first serve in, then cross or come in and finish at the net."- Sienna Opray
Asked how they complemented each other on the court?
"We love volleying," Opray said. "So we try and get that first serve in, then cross or come in and finish at the net."
This year was the first time Opray and Wilson have competed at the championships, though Wilson has attended Warrnambool's Easter tournament since she was 12.
"I haven't been to this one, but our coaches recommended it," Wilson said.
"So we thought we'd do, and play doubles together. And we're staying together.
"It's been really fun."
IN OTHER NEWS:
Now just one tap with our new app: Digital subscribers now have the convenience of faster news, right at your fingertips with The Standard:
Our journalists work hard to provide local, up-to-date news to the community. This is how you can access our trusted content:
Sign up for our newsletter to stay up to date.