Bencic and Paul coasted through the first set but won a total of just 12 points in the second set as the match went into a tiebreak.
'I had a deja vu moment on court. I had match point on the same side of the court, went for the same serve and was telling myself the same things. I had goosebumps, it was really special. It's great to win here again.'
Belinda Bencic won two tiebreaks to beat teenage Russian seventh seed Mirra Andreeva
The Polish eighth seed walloped Liudmila Samsonova 6-2, 7-5 to reach the Wimbledon semi-finals for the first time.
The opening Grand Slam of the year begins at Melbourne Park on Sunday.
The 35th-ranked Bencic did not do a lot wrong but was broken twice in the first set and three times in the second as a sizzling Swiatek brought her A-game to what turned into a one-sided contest.
Poland battled past Switzerland 2-1 in the United Cup final on Sunday to banish the pain of title-round defeats in the previous two editions and secure a long-awaited maiden triumph in the season-opening mixed-team competition.
World number one Aryna Sabalenka has been named WTA Player of the Year for the second consecutive season after spending the entire year at the top of the rankings.
Iga Swiatek heads into Melbourne Park with the Australian Open title the only gap on her Grand Slam resume, but the world number two is keen to avoid setting herself targets for the new season and says her main goal is to improve her game.
Top trio eye Grand Slam glory with Sabalenka targeting third Australian Open crown
Jannik Sinner has withdrawn from the U.S. Open mixed doubles event, where he was going to partner Katerina Siniakova, a day after illness forced the world number one to retire five games into his Cincinnati Open final.
'I guess it'll force me to read books more, be more of a productive human probably.'
Belinda Bencic reached her first-ever Grand Slam semi-final on Wednesday, fending off Donna Vekic to win 7-6(5), 6-3 in their US Open last-eight clash.
Belinda Bencic of Switzerland and Danielle Collins were among those to win their first-round matches at the Adelaide International
World number 12 Belinda Bencic dug deep to overpower the Czech Republic's Marketa Vondrousova 7-5, 2-6, 6-3 on Saturday and win the Tokyo Games women's singles title, becoming the first Swiss woman to earn an Olympics tennis gold.
The first stop on Serena Williams' farewell tour came to a quick end as she fell to Belinda Bencic in second-round action at the Canadian Open on Wednesday a day after announcing her forthcoming retirement from tennis.
The unseeded Bencic, who also beat former world number ones Caroline Wozniacki and Ana Ivanovic in Toronto, wore a look of disbelief after the 18-year-old's forehand winner whizzed past Williams to seal the match.
The final will pit power against power when Andreescu takes on her childhood hero Williams, who claimed her first US Open title in 1999 before Andreescu was even born.
Eugenie Bouchard's best year was 2014 when she reached the semi-finals of the French and Australian Opens, and the final of Wimbledon.
Playing in only her second singles match of the year, Bouchard blasted a forehand winner to take the first set but Colombian Arango turned the tables in the second set amid a cascade of unforced errors from her opponent.
Images from Day 8 of the Australian Open at Melbourne Park on Sunday.
- At 18 years and 109 days, Bencic is the youngest player to win a premier-level title since Caroline Wozniacki won in New Haven almost seven years ago - Uzbek Istomin wins men's title
Switzerland's Belinda Bencic became the first teenager in seven years to reach the top 10 of the WTA rankings after she climbed to ninth in the world on Monday.
Electronic line calling systems were also affected by the power cut, the ATP said, while spectators shared pictures of dark hallways at the Manzanares Park Tennis Center.
Dimitrov was showing signs of fatigue from his three-hour third-round match earlier in the week and could do little to stop the Spanish world number three, who next faces Argentine Francisco Cerundolo.
Bencic broke Aiava at love to open the match, one of the six break points she converted, and was never really tested as the 18-year-old Australian made 24 unforced errors.
Former World No 1 Caroline Wozniacki and rising Swiss talent Belinda Bencic have withdrawn from the French Open due to injuries, the WTA said.
Iga Swiatek demolished Amanda Anisimova 6-0, 6-0 in just under an hour to clinch her first Wimbledon title and fifth Grand Slam crown overall.
Nine of the world's top-10 men and nine of the top-10 women have officially entered into the U.S. Open's revamped mixed doubles event, tournament organisers said on Tuesday, with former singles champions Carlos Alcaraz and Emma Raducanu teaming up.
World number one Naomi Osaka lost in three sets to unseeded Swiss Belinda Bencic in the Madrid Open quarter-finals on Thursday as Simona Halep, Sloane Stephens and Kiki Bertens completed the final four line-up.
Novak Djokovic reached the Wimbledon quarter-finals for the 16th time but it proved a hard day's work at his Centre Court office.
At an oven-like Centre Court where the temperature climbed to 30 degrees Celsius, Sabalenka twice rushed to the aid of ill fans by supplying bottles of cold water and an ice pack, before she cracked under pressure from her opponent in the 10th game.
Poland's Iga Swiatek could become only the third woman since tennis turned professional in 1968 to win all of her first six major finals, joining Margaret Court and Monica Seles, but Swiatek is not taking the big-hitting Anisimova lightly.
All the action from Day 4 at the Australian Open on Wednesday
In the clash of legends, Roger Federer got the better of Serena Williams in their historic clash in the mixed doubles at the Hopman Cup in Perth on Tuesday.
Germany's Andrea Petkovic was visibly emotional on Tuesday as she headed into retirement following a 6-2, 4-6, 6-4 loss to Swiss Olympic champion Belinda Bencic in the first round at the US Open.
Carlos Alcaraz secured his passage into the fourth round of the Australian Open with a 6-2, 6-4, 6-7(3), 6-3 victory over Nuno Borges.
Swiss seventh seed Belinda Bencic was stunned by Slovakia's Magdalena Rybarikova while former champion Ana Ivanovic was also sent packing in third-round action at the BNP Paribas Open in California.
Daniil Medvedev jumped for joy in an uncharacteristically emotional celebration after holding off young Frenchman Arthur Fils for a 6-4, 2-6, 7-6(7) win amid gusting winds on centre court in quarter-finals of the BNP Paribas Open, at the Indian Wells Tennis Garden, on Thursday.
The Olympic tennis competition suffered another blow as women's third seed Elena Rybakina joined a lengthy list of non-starters hours after the draw took place at Roland Garros on Thursday