The two players merely acknowledged each other with a wave before heading off court.
Jelena Jankovic eased into the last four at the BNP Paribas Open on Thursday when Ukrainian qualifier Lesia Tsurenko retired from their quarter-final with an ankle injury while trailing 6-1, 4-1.
Battle-scarred Argentine Juan Martin del Potro clinched his 21st career title with a 6-4, 6-4 win over Kevin Anderson in the Mexican Open final in Acapulco on Sunday.
Swiatek no fan of 'Iga's Bakery' memes after serving up another double bagel
The Pole, who won the crown in 2020 and hasn't lost since February, matched Serena Williams's winning run from 2013 in the process, having now lost only two sets in her last four tournaments.
Rafael Nadal has not played since sustaining a hip injury at the Australian Open in January.
Home favourite Zhang Shuai looked in complete control as she dismissed Magda Linette 6-4 6-2.
Ash Barty's bid to end the host nation's long wait for a homegrown Australian Open champion will begin against Ukraine's Lesia Tsurenko
The 27-year-old's only appearance so far this year was at the French Open where she lost in the second round.
'I felt comfortable knowing that I just needed to change a few things, to adjust, to try and bring the match back in my favour'
Factbox on Belarus' Aryna Sabalenka, who beat China's Zheng Qinwen in the Australian Open final on Saturday
World No 14 Marin Cilic is through to the semi-finals of the Kremlin Cup after the Croat easily beat Russia's Andrei Kuznetsov 6-2, 6-1 on Friday.
Rising star Brandon Nakashima handed fellow American John Isner a first round defeat at the Indian Wells.
Petra Kvitova won her third title of the year as she fought back from a set down to beat Romanian Mihaela Buzarnescu 4-6, 6-2, 6-3 in the Prague Open final on Saturday.
Images from Day 6 of the 2024 Australian Open in Melbourne on Friday.
Her parents are now staying at her apartment while the rebuilding work takes place at their home in Irpin
Garbine Muguruza emerged as a favourite to win the Italian Open after beating Latvia's Jelena Ostapenko to reach the third round after world number one Angeliquer Kerber had earlier bowed out to Estonian qualifier Anett Kontaveit.
Grigor Dimitrov dispatched American 10th seed Frances Tiafoe in straight sets with a convincing 6-2 6-3 6-2 victory on Sunday.
In a rematch of last year's French Open final, Barty prevailed once again, winning 6-3, 6-3 for a 4-0 head-to-head lead over the Czech.
Stefanos Tsitsipas enjoyed an incident-free path into the third round of the French Open with a win over Roberto Carballes Baena.
* Swiatek started playing tennis in an attempt to emulate her older sister, who competed briefly on the junior circuit.
Sharapova's quarter-final defeat by Williams at the 2016 Australian Open was the last competitive match the Russian played for 15 months after she received a doping ban while American Williams was on a maternity break for most of 2017.
Japan's Kei Nishikori overcame Daniil Medvedev in the Brisbane International final on Sunday for his first ATP title in nearly three years and the 12th of his career.
Maria became the sixth woman in the Open era to reach the Wimbledon semis after her 34th birthday.
Maria Sharapova withdrew from the Rogers Cup with a sore left arm on Thursday, putting the five-time grand slam champion's US Open participation in doubt.
However, Ramkumar Ramanathan and Ankita Raina's campaign ended in the first round itself.
Photos from matches played at the US Open in Flushing Meadows on Sunday
Form guide for American Serena Williams ahead of Thursday's US Open semi-final clash against Latvia's Anastasija Sevastova:
American Serena Williams withdrew from the French Open on Monday, shortly before she was due on court to face Maria Sharapova in a much-anticipated fourth round showdown.
Images from Day 1 of the Australian Open in Melbourne on Monday.
Maria Sharapova shook off some rust after injury and a 15-month doping ban to beat Jennifer Brady in her first match in the United States in more than two years on Monday at the Stanford Classic.
Ash Barty ended Australia's 44-year wait for a home winner at the Australian Open when the world number one staved off a fightback from American Danielle Collins to complete a 6-3, 7-6(2) win.
Summary of sports events and persons who made news on Saturday
IMAGES from Day 10 of the US Open matches played in New York on Wednesday
Earlier on Wednesday, Czech Karolina Pliskova was forced to withdraw from the tournament due to a viral illness.
Andy Murray embarks on his first Grand Slam campaign as world number one with much stronger title credentials, even if he has lost five finals at Melbourne Park.
Images from Day 4 of the 2024 Australian Open in Melbourne on Wednesday.
News of all that's transpired on and off the tennis courts.
More sporting bodies sanctioned Russian and Belarusian athletes on Tuesday over Russia's invasion of Ukraine
World No 55 Haase improved to a 2-2 career record against Zverev, including victories in their last two meetings.