World number one Aryna Sabalenka brushed aside Spain's Jessica Bouzas Maneiro in straight sets in the opening round match.
Jannik Sinner received a favourable French Open draw while Novak Djokovic faces a challenging path. Coco Gauff and Aryna Sabalenka are set for a possible semi-final clash at Roland Garros.
World number one Aryna Sabalenka insists she has fully shaken off the physical woes that derailed her French Open preparations, despite arriving at Roland Garros without a semi-final appearance on clay this season.
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.
Carlos Alcaraz, who advanced to the last eight in Cincinnati for the third time, has now won 36 of his last 38 matches.
Poland's world number one Iga Swiatek swatted aside 25th seed Anastasia Pavlyuchenkova 6-4, 6-2 with a near-flawless performance to reach the round of 16 for a fourth straight year at the U.S. Open on Saturday.
Coco Gauff started her quest for a maiden Australian Open title with a straight games win over Kamilla Rakhimova to reach the second round.
Alexander Zverev rallied from a set down to beat defending champion Alexei Popyrin in Toronto and move into the semi-finals.
Michelsen, seeded 26th, will face hard-hitting 11th seed Karen Khachanov of Russia, who upset eighth seed Casper Ruud in their fourth round match 6-4, 7-5.
Czech reigning champion Marketa Vondrousova, seeded sixth and in the same quarter of the draw as Swiatek, will open against Spain's Jessica Bouzas Maneiro.
Sabalenka relied on her trademark powerful serve to hold firm in the key moments, winning two tiebreaks to take her tally to 18 for the season, the most by any women's singles player in the professional era.
Sofia Kenin advanced to the Toray Pan Pacific Open semifinals with a 6-3, 6-4 upset of No. 3 seed Daria Kasatkina on Friday in Tokyo.
All the action from Day 4 at the Australian Open on Wednesday
IMAGES from Day 2 of the Wimbledon Championships, at the All England Lawn Tennis and Croquet Club, London, on Tuesday.
No. 6 seed Yuan Yue came back from down 3-0 in the second set to win the last six games of the match and defeat former world No. 1 Simona Halep on Monday in the opening round of the Hong Kong Open.
Serena Williams set Flushing Meadows abuzz on Saturday as the 23-time major winner appeared at the US Open - as a fan
Defending champions Iga Swiatek and Carlos Alcaraz powered into the second round of the French Open on Monday.
Former champion Iga Swiatek kicked off her US Open campaign with a 6-1, 6-2 win over Colombia's Emiliana Arango on Tuesday as the Pole aims to keep her hot streak on track in New York.
Pain free Vondrousova getting old magic back on grass
Aryna Sabalenka opened her bid for a third straight Australian Open title with an easy victory over Sloane Stephens on Sunday.
'When you are playing team events in these Games, it's a completely different atmosphere.' 'There's pressure, there's excitement, it's a completely different vibe.'
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