The US raced into a 5-0 lead in the tiebreak, and though the Greek duo rallied to level at 6-6 a perfectly placed volley from Harrison squeezed through Tsitsipas's legs and sealed a 4-6, 6-4, 10-8 victory.
Victoria Mboko, a 19-year-old Canadian tennis player, defeated Australian Open champion Elena Rybakina in the Qatar Open quarter-finals, marking a significant step towards entering the WTA top 10 rankings.
Muchova says Grand Slam hunger behind another Sakkari upset in Paris
Defending champion Krejcikova edges Dolehide to move into third round at Wimbledon 2025
Serena Williams was sent spinning out of the Western and Southern Open by Maria Sakkari on Tuesday after the Greek rallied from a set down to beat the 23-times Grand Slam champion 5-7, 7-6(5), 6-1 and reach the quarter-finals.
The Finals, contested by the world's top eight singles players and eight doubles teams, was moved out of China's Shenzhen after last year's event was cancelled due to the COVID-19 pandemic.
Emma Raducanu beat four-time Grand Slam champion Naomi Osaka 6-4, 6-2 in their first career meeting to reach the quarter-finals of the Washington Open on Thursday.
World number one Iga Swiatek dominated ninth seed Maria Sakkari to win the Indian Wells final.
Maria Sakkari knocked out reigning champion Paula Badosa in Friday's Indian Wells semi-finals and will take on Iga Swiatek in the title decider after the world number four fought back from a break down in each set to overpower Simona Halep.
Images from Day 11 of the 2021 French Open at Roland Garros in Paris on Wednesday.
Shelton blasted an ace on match point to seal the win and avenge his five-set loss to Tiafoe at last year's U.S. Open as the 22-year-old continues to make strides in his breakout season.
Images from Day 6 of the 2021 US Open in New York on Saturday.
Images from Day 1 of the 2024 Australian Open in Melbourne on Sunday.
World number one Aryna Sabalenka reached the last 16 at the Miami Open when Elena-Gabriela Ruse retired injured on Saturday, while men's top seed Alexander Zverev beat Jacob Fearnley 6-2, 6-4 to reach the third round.
Images from Day 12 of the 2021 French Open at Roland Garros in Paris on Thursday.
Carlos Alcaraz kept his Indian Wells 'three-peat' campaign on track with a straight sets win against Canadian Denis Shapovalov in the third round.
Paula Badosa overcame a slow start to take down Belarusian top seed Aryna Sabalenka after Maria Sakkari continued her dominance of Iga Swiatek in the round-robin stage of the WTA Finals in Guadalajara, Mexico on Thursday.
Images from Day 8 of the 2021 US Open in New York on Monday.
On a day when top seed Sloane Stephens survived a scare before beating Ajla Tomljanovic 4-6, 6-4, 6-4, Sakkari showcased supreme court coverage skills throughout her almost two-hour match against Bertens.
Top-ranked Iga Swiatek cruised past Veronika Kudermetova in the semi-final of the Madrid Open to set up a second straight final showdown with world number two Aryna Sabalenka.
Andy Murray will not get another chance to feature on court in his farewell at the Grand Slam.
Third seed Andrey Rublev suffered a first round exit after his Qatar Open title, losing to qualifier Quentin Halys 3-6, 6-4, 7-6(5) at the Dubai Open on Tuesday.
Spain's Paula Badosa ground out a 7-6(4), 6-4 victory over Maria Sakkari at the WTA Finals in Guadalajara, Mexico on Saturday and advanced to the semi-finals with two wins from two matches in Group Chichen Itza after Aryna Sabalenka beat Iga Swiatek.
Stefanos Tsitsipas moved into the Australian Open final on Friday, taking a step towards becoming the first Greek world number on.
Novak Djokovic hampered by wrist issue at United Cup
Top seed Ash Barty rallied from a set down to power into the semi-finals of the Cincinnati Masters on Friday.
The Spaniard needed less than 90 minutes to dispatch the 23rd seed from Italy
Elena Rybakina knocked out defending champion Iga Swiatek at Indian Wells on Friday to set up a clash against Aryna Sabalenka in the final.
IMAGES from Day 5 of the Wimbledon Championships, at the All England Lawn Tennis and Croquet Club, London, on Friday.
Swiatek, the 2022 champion, made her intentions clear early on with an aggressive start to claim a break for a 2-1 lead. She pulled further away when Kostyuk hit a double fault two games later, wrapping up the opening set in 31 minutes.
Canada's Bianca Andreescu upset Greek seventh seed Maria Sakkari to reach the last 32, while Japan's Taro Daniel crushed world number 15 Alexander Zverev.
Images from Day 10 of the 2021 US Open in New York on Thursday.
Iga Swiatek's hopes of landing another 'Sunshine Double' ended in a 6-4, 6-2 fourth round loss to Ekaterina Alexandrova on Monday as the world number one joined third seed Coco Gauff in making an early exit from the Miami Open.
Serena Williams likened the frustration she felt in Tuesday's shock defeat by Maria Sakkari at the Western and Southern Open to that of being stuck in a bad relationship.
Rafael Nadal made a triumphant return to Roland Garros on Sunday
Daniil Medvedev quelled the challenge of wildcard Arthur Fery and Marta Kostyuk fought back to upset Maria Sakkari and storm into the Wimbledon second round on a rainy Wednesday.
As Rafael Nadal prepares to ride off into the sunset after a stellar career, his fellow professionals from eras old and new agree on one thing - the Spaniard remains an inspirational role model whose legacy has shaped tennis over the last 23 years.
IMAGES from Day 1 of the US Open played Flushing Meadows, New York, United States, on Monday.
Amanda Anisimova has confessed that she was a bundle of nerves after staring down the barrel of an early exit from the US Open during her second-round battle against fellow American teenager Katrina Scott on Thursday.
Leylah Fernandez's storybook US Open continued with yet another upset on Thursday, as the Canadian teenager shocked second seed Aryna Sabalenka 7-6(3), 4-6, 6-4 to reach her first Grand Slam final.