Nick Kyrgios produced a serve-and-volley masterclass to topple world number one Daniil Medvedev 6-7(2), 6-4, 6-2 for his eighth straight win on a day of upsets, while American Tommy Paul rallied to beat Spanish second seed Carlos Alcaraz.
Fourth-ranked Carlos Alcaraz and Norway's world number seven Casper Ruud also have a shot at top spot.
Alexander Zverev continued to rebuild his confidence on clay with a straight sets win over Spain's Roberto Bautista Agut in the Monte Carlo Masters second round.
Learner Tien is the youngest American man to reach the third round of the Australian Open since an 18-year-old Pete Sampras in 1990.
Twice champion Iga Swiatek walloped Czech Karolina Muchova in straight sets to reach the Indian Wells quarter-finals on Tuesday.
Carlos Alcaraz said he thought the trio of teenagers who have lit up the first week of the Australian Open have the skills to play the game at the top level
Novak Djokovic's outstanding serving, mighty forehand and all-court defence delivered him a ninth straight win over Stefanos Tsitsipas in their Red Group match.
Images from Day 3 of the 2023 French Open at Roland Garros in Paris on Tuesday.
IMAGES from Day 8 of the action at the US Open at USTA Billie Jean King National Tennis Center at Flushing Meadows in New York on Monday.
Jannik Sinner made it two wins out of two at the ATP Finals as he fought off Taylor Fritz in a high-octane clash inside the Inalpi Arena on Tuesday.
World number one Carlos Alcaraz sailed into the Paris Masters third round with a 6-4, 6-4 win over Yoshihito Nishioka but Rafael Nadal and Daniil Medvedev both slumped to surprise losses on Wednesday.
Lehecka struck eight aces and converted four of eight break chances to secure the first Top 3 win of his career.
'Of course I am happy to reach No. 1. It was my goal since I was young and especially my goal in the latest times.'
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.
Amazon has exclusive TV broadcast rights in France for the night sessions, which are taking place for the first time at Roland Garros. The late matches are being played without fans on Court Philippe-Chatrier because of the 9 p.m. curfew.
Novak Djokovic stayed on course as he entered the Wimbledon quarterfinals on Monday.
The French Open will be held in Paris from May 22 to June 5.
Taylor Fritz moved closer to the semis of the season-ending ATP Finals after the American beat Alex de Minaur 5-7 6-4 6-3 in their last group game on Thursday, but he will have to wait and see if Jannik Sinner can take a set off Daniil Medvedev.
Ninth seed Auger-Aliassime, 21, was the dominant player in the first set and despite a wobble when serving at 6-5 he won a tiebreak courtesy of some Medvedev double-faults the Russian later blamed on the sweaty conditions.
Medvedev squandered a two-set lead against Nadal in their previous meeting in the Melbourne final in January, allowing the Spaniard to clinch his 21st Grand Slam title.
Hubert Hurkacz showed his Wimbledon credentials on Sunday, hammering world number one Daniil Medvedev
Daniil Medvedev's bid to reclaim the world number one ranking fell short on Thursday as the Russian lost 7-6(7), 6-3 to Poland's Hubert Hurkacz in the Miami Open quarter-finals.
Daniil Medvedev was fined for an outburst against the umpire
Russian Daniil Medvedev's 2022 season opened with a stunning defeat at the hands of Frenchman Ugo Humbert after a three-hour dogfight in a steamy Ken Rosewall Arena at the ATP Cup on Sunday.
Russia's Daniil Medvedev defeated Benoit Paire of France 6-3, 6-4 in the first round of the Abierto Mexicano tournament in Acapulco on Tuesday to get his quest for the world number one ranking off to a winning start.
Images from the US Open men's singles quarter-finals at Flushing Meadows, New York, on Wednesday.
The match marked world number two Medvedev's ninth win in a row at the ATP Finals and he improved his head-to-head record over Ruud to 3-0.
Medvedev will be glad to play the role of dream wrecker once again.
Zverev is also in fine form, having beaten world number one Novak Djokovic on his way to claiming the Olympic gold medal in Tokyo at the start of the month.
Russian Daniil Medvedev delivered the performance of a lifetime to win the US Open on Sunday and deny Novak Djokovic a rare calendar year Grand Slam.
Sinner advanced with a 6-3, 7-6 (3) victory over home favorite Bu Yunchaokete and No. 2 seed Alcaraz held off No. 3 Daniil Medvedev 7-5, 6-3 in Tuesday's semifinals.
US Open champion Daniil Medvedev may have to provide assurances that he does not support Russian president Vladimir Putin if he is to compete at this year's Wimbledon, British Sports Minister Nigel Huddleston said on Tuesday.
The Russian ended Djokovic's hopes of completing a sweep of all four Grand Slam titles in 2021 when he defeated the Serb in the US Open final in September to pick up his maiden major.
'I have the feeling that people [are] starting more and more to... respect what he has done in tennis more and more, because he continues to beat the records'.
No. 2 seed Casper Ruud of Norway will take on unseeded Denis Shapovalov of Canada in the Dallas Open final on Sunday after both notched semi-final victories.
Novak Djokovic, who won Wimbledon to take his major singles titles to 21, has opted not to be vaccinated against COVID-19. He said on Thursday he could not fly to New York for the year's final Grand Slam.
Russia took an unassailable 2-0 lead over Croatia in the Davis Cup final in Madrid on Sunday to secure their third title and first in 15 years, as Daniil Medvedev outlasted Croatian Marin Cilic 7-6(7), 6-2.
'It's disappointing. It's disrespectful. I'm not sure ... I'm going to want to play tennis'
French Open 2021 finalist Anastasia Pavlyuchenkova called for an end to violence and war in a social media post on Monday.
Learner Tien became the youngest man to reach the Australian Open fourth round in 20 years
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