Andrey Rublev moved into his third Masters final after fighting back from a set down in Monte Carlo to beat American Taylor Fritz 5-7, 6-1, 6-3 on Saturday to set up a showdown with Danish teenager Holger Rune.
Greece's Tsitsipas battled back from 3-5 down in the third set to eliminate Medvedev with a 6-3, 6-7(11), 7-6(1) win to set up a showdown on Friday with Rublev for the Red Group's other semi-final spot.
After a gutsy performance that pushed Sinner to four sets, the Italian world number one ultimately proved too strong. Yet the Canadian said he would carry plenty of positives forward from Flushing Meadows.
Images from the men's singles fourth round matches on Day 8 of the 2023 Australian Open in Melbourne on Monday.
It was Roger Federer's fastest defeat since losing to Franco Squillari in 54 minutes in Sydney in 2003.
A sluggish Carlos Alcaraz was beaten 6-7(3), 6-3, 6-4 by Alexander Zverev on the his debut at the ATP Finals on Monday to continue his end-of-year slump with a third straight defeat.
Defending ATP Finals champion Novak Djokovic has pulled out of the season-ending event in Turin through injury, the Serbian said on Tuesday.
Friday's match was a straight shootout for a last-four place, with world number five Rublev the favourite having won his four previous matches against Ruud.
Italian top seed Matteo Berrettini marked himself down as a genuine Wimbledon threat after beating Britain's Cameron Norrie 6-4, 6-7(5), 6-3 to win the Queen's Club title on Sunday.
Rangy 19-year-old Mensik, the 2022 boy's singles finalist at Melbourne Park, sealed the match in style with a searing forehand winner to push the three-times Grand Slam finalist and sixth seed to the exit.
Rohan Bopanna and his Australian partner Matthew Ebden lost to Russian pair of Andrey Rublev and Karen Khachanov.
The escalating conflict involving the U.S. and Israel with Iran has led to widespread disruption in the world of sports, with events postponed, travel plans thrown into chaos, and athletes seeking asylum.
IMAGES from Day 4 of the matches played at the Australian Open at Melbourne Park on Wednesday.
Third-ranked Carlos Alcaraz recorded a 7-5, 6-2 win over seventh-seeded Karen Khachanov of Russia to advance to the semifinals of the China Open on Monday in Beijing.
'We heard it was like the Hollywood of mixed doubles.'
One of the rising stars of the men's tour, Fonseca shocked ninth seed Andrey Rublev on his Grand Slam main draw debut at the Australian Open in January and became the youngest Brazilian to win an ATP tournament at the Argentina Open the following month.
Tsitsipas, who triumphed at the Monte Carlo Country Club in the last two editions, was never in the mix against Fritz
Medvedev beats Rublev in Dubai for hard-court hat-trick
Argentinian Francisco Comesana stunned Australian Open finalist and world number two Alexander Zverev on Friday with a 4-6, 6-3, 6-4 win in the quarter-finals of the Rio Open, the biggest win of his career so far.
Serena was rumoured to have dated Dimitrov in the past, adding an extra layer of intrigue to the occasion.
The 18-year-old captured the Argentina Open title with a in over home favourite Francisco Cerundolo in the final.
Rafael Nadal gave Russian teenager Andrey Rublev a tennis lesson on Wednesday, racing into the semi-finals of the US Open with a ruthless 6-1, 6-2, 6-2 win that cleared the path for a possible showdown with rival Roger Federer.
An off-colour Alcaraz lost 6-1, 7-5 to Norway's Casper Ruud in his opening match on Monday and the 21-year-old cancelled a public training session the following day.
Sweltering heat gripped the second-round action at the US Open on Wednesday
Italy's Matteo Arnaldi produced a sensational performance to take out sixth seed Andrey Rublev and reach the last 16 of the French Open on Friday.
It marks Osaka's first WTA 1000 semi-final since Miami in 2022, as the Japanese former world number one needed just over an hour to secure victory over the 10th seeded Svitolina.
Novak Djokovic secured a semi-final place at the ATP Finals with a 6-3, 6-2 victory over Russian Andrey Rublev on Wednesday, his 50th match win of the year, while Stefanos Tsitsipas withdrew from the tournament due to an elbow injury.
The 35-year-old Serb was sent home from Australia on the eve of last year's event after a row about his COVID-19 vaccination status.
In the evening session, men's third seed Alexander Zverev and women's fourth seed Jessica Pegula were forced off the court mid-match due to rain and the threat of lightning.
Top seed Carlos Alcaraz of Spain and No. 8 seed Hubert Hurkacz of Poland will clash in the ABN Amro Open semi-finals on Saturday after both posted victories on Friday in Rotterdam, Netherlands.
Lehecka struck eight aces and converted four of eight break chances to secure the first Top 3 win of his career.
No. 1 seed Carlos Alcaraz of Spain was pushed to three sets before finishing off Dutch wild card Botic van de Zandschulp in the first round of the ABN AMRO Open.
Shapovalov and Pospisil, who have shouldered the burden through four ties in La Caja Magica this week, combined to beat Andrey Rublev and Karen Khachanov 6-3, 3-6, 7-6(5).
Andrey Rublev and Alexander Zverev clinched the Laver Cup for Team Europe with a 6-2, 6-7(4), 10-3 win over Team World's Reilly Opelka and Denis Shapovalov on Sunday in Boston.
'You cannot imagine, one player is going to die and then they're going to see'
Zverev and Rublev among dark horses for French Open
Iga Swiatek was the latest top player to suffer an upset loss in Montreal as the Wimbledon champion
Jannik Sinner's bid to win back-to-back Halle Open titles was ended on Thursday
Australian Open organisers have issued a reminder to players and their entourages about their policy on "inappropriate flags" after a video emerged showing Novak Djokovic's father posing for pictures with fans holding Russian flags.
Top seed Carlos Alcaraz withstood a charge from qualifier Luca Nardi for a 6-1, 4-6, 6-3 victory in the second round of the Qatar ExxonMobil Open in Doha on Wednesday.
