Ash Barty defeated Elena Rybakina in straight sets to claim the Adelaide International title, while Simona Halep clinched silverware in Melbourne.
World number one and heavy favourite Barty prevailed 6-3 6-2 against Rybakina to claim the Adelaide title for a second time in three seasons.
The 25-year-old recovered from 40-15 down in the seventh game and went on to immediately earn the only break of the opening set.
Barty did not look back as she held throughout the second set, meaning she went 35 consecutive games without losing serve to conclude the tournament.
After securing a 14th WTA singles title in a little over an hour, Barty now turns focus to next week's Sydney Tennis Classic ahead of beginning her Australian Open campaign.
"I feel good leading up to an Australian Open like I have every year," Barty, who hit 17 winners to 13 unforced errors, said after seeing off Rybakina.
"Each and every preparation is unique. We take it for what comes and what it is, move on, try and do the best that we can in every opportunity.
"It has absolutely no effect on the way that I prepare or the way I'm thinking leading forward just because it's a Grand Slam. It doesn't change for us."
Halep, one of Barty's likely rivals for the Australian Open crown, also made a bright start to the year by overcoming Veronika Kudermetova in the Melbourne Summer Set 1 final.
The number two seed, who is aiming to put last year's injury-ravaged and trophyless season behind her, came out on top 6-2 6-3.
She recovered from an early break down in the first set and again in the second to make it 23 career titles, and a first since the 2020 Italian Open.
It could easily have been a different story, however, as Kudermetova had three break points to move 3-0 ahead in the second set, but the Russian could not take full advantage.
Amanda Anisimova defeated Aliaksandra Sasnovich at the Melbourne Summer Set 2 final to claim the first WTA title of the season, and her second overall.
Belarusian qualifier Sasnovich hit back in style to take the second set 6-1 after losing the opener 7-5, but Anisimova recovered from a break down to edge the deciding set 6-4.
In doing so, Anisimova became the first American to win a title on Australian soil since Sofia Kenin's Australian Open triumph in 2020.
Griekspoor heroics send the Netherlands to historic Davis Cup final
Tallon Griekspoor produced a thrilling comeback to help the Netherlands reach the Davis Cup final for the very first time after they downed Germany 2-0 in Malaga.
After losing the opening set to Jan-Lennard Struff, Griekspoor held his nerve to emerge a 4-6 (4-7) 7-5 6-4 victor on an enthralling day of action on Friday.
Earlier in the day, Botic van de Zandschulp, who beat Rafael Nadal in the final match of the Spaniard's career on Tuesday, put the Dutch 1-0 up with a win over Daniel Altmaier.
The world number 80 needed 10 match points to wrap up a tense 6-4 6-7 (12-14) 6-3 victory, after Altmaier saved five break points in a second set tie-break.
Griekspoor then stopped the best-of-three tie from going to the deciding doubles, rallying back with a fine display, though Struff let two crucial break points slip in the eighth game of the second set.
“We have been talking about this [moment] for two or three years,” said Griekspoor.
“We came here all the time with unbelievably tough draws, but we believed in ourselves so much. We always felt like this was possible.
"To do it now feels unbelievable. I am so happy for the team, and for Holland.
“I just tried to focus on my own game. I felt like he was playing unbelievable tennis, I didn’t do much wrong in the first set.
"I’m super proud of myself, super proud of the effort and very happy to get the win in the end.”
The Netherlands await either reigning Davis Cup champions Italy or Australia, who face off in the other semi-final on Saturday.
Data Debrief: Dutch delight
After reaching the semi-final stage for only the second time this century, the Netherlands produced arguably their finest display of the tournament against Germany.
It meant that after 185 ties played at the event across a 104-year timeframe, they had finally reached the showpiece match at the tournament for the first time.
But their victory was made possible by Griekspoor, who converted both his break points, while fittingly sealing his encounter with his 25th ace of the contest.
France 37-23 Argentina: Les Bleus wrap up campaign with third win
France posted a comfortable 37-23 win over Argentina on Friday to make it three wins out of three tests at the Stade de France to conclude their Autumn Nations Series.
Having also beaten New Zealand and Japan in Paris this month, Fabien Galthie's side claimed four tries, including a superb solo effort from Louis Bielle-Biarrey, as they eased to victory against the Pumas.
The hosts led 30-9 at the break after Argentina's Julian Montoya and Juan Martin Gonzalez were both shown yellow cards in the first half, with Thomas Ramos slotting his third penalty of the game.
Tomas Albornoz made it 30-16 for Felipe Contepomi's visitors, but their hopes of a comeback were dashed as Bielle-Biarrey scored his fourth try in three games before Ramos made it 37-16.
Albornoz then cut the deficit to 37-23 with a two-pointer with nine minutes to play, but that wasn't enough to stop his side from falling to a defeat.
"We knew it was going to be an 80-minute game. We saw last week how Argentina went all the way against a good Irish team," France lock Emmanuel Meafou told TNT Sports.
"We are happy with the win. We have three from three [in the autumn] and we will look to build on that in the Six Nations next year."
Plymouth Argyle 2-2 Watford: Two-goal Gray rescues point for Rooney's side
Andre Gray scored twice against his former club to salvage a point for struggling Plymouth Argyle as they drew 2-2 with Watford on Friday.
Gray curled in an equaliser in the sixth minute of second-half stoppage time to seal a crucial point for Wayne Rooney's side in their bid for survival in the Championship.
The visitors made a quick start at Home Park when Ivorian striker Vakoun Bayo bundled in a cross from Yasser Larouci only eight minutes in.
Plymouth did, however, equalise against the run of play in the 23rd minute when Lewis Gibson's long ball into the box was met with a spectacular volley from Gray.
Watford regained the lead before the break when Imran Louza's free-kick was knocked back by Mattie Pollock, with centre-back Ryan Porteous on hand to steer the ball home.
But just as it looked like Watford would go home with all three points, Gray picked up the ball on the edge of the area and fired home a stunning effort beyond Daniel Bachmann.
Tom Cleverley's Watford sit in fifth place and trail leaders Sunderland by five points, while Plymouth are 17th with 17 points from 16 matches.
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