US Open day nine
Highlights of the ninth day at the U.S. Open at Flushing Meadows on Monday (times GMT):
0230 ANISIMOVA BLAZES PAST HADDAD MAIA, SINNER THROUGH
American eighth seed Amanda Anisimova made light work of Beatriz Haddad Maia, beating the Brazilian 6-0 6-3 to book her place in the quarter-finals for the first time in her career.
The 24-year-old will next face six-times Grand Slam champion Iga Swiatek in a rematch of the Wimbledon final, which the Pole had won.
On the men's side, Italian top seed Jannik Sinner ruthlessly continued his title defence with a 6-1 6-1 6-1 thrashing of Alexander Bublik. Next up for the four-times major winner is compatriot Lorenzo Musetti, the 10th seed.
2029 MUCHOVA SURVIVES KOSTYUK THRILLER
Czech 11th seed Karolina Muchova recovered from a second-set wobble to beat Ukrainian Marta Kostyuk 6-3 6-7(0) 6-3. She faces four-times Grand Slam champion Naomi Osaka in the quarters.
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PREVIEW-Djokovic faces Fritz, Sabalenka and Pegula meet Czech hopefuls at US Open
Ruthless Sinner routs Bublik to reach US Open quarter-finals
Serena coaching from afar as Venus and Fernandez reach US Open doubles quarters
US Open underdogs Osaka, Auger-Aliassime storm into quarter-finals
Osaka finally overcomes stormy waters to sail past Gauff and into US Open quarters
Swiatek mindful of young fans at US Open after souvenir grab goes viral
Auger-Aliassime's revival rolls on at US Open with clinical win over Rublev
Swiatek breezes past Alexandrova into US Open quarter-finals
Fritz reaches US Open quarters as Townsend loses epic
2017 MUSETTI CRUISES PAST MUNAR
Italian 10th seed Lorenzo Musetti carved out a comfortable 6-3 6-0 6-1 victory over Spain's Jaume Munar to advance to the last eight at Flushing Meadows for the first time.
1933 OSAKA KNOCKS OUT GAUFF
Four-times Grand Slam champion Japanese Naomi Osaka secured her place in the quarters by eliminating American third seed Coco Gauff 6-3 6-2, ending the French Open champion's run in the tournament.
1815 SWIATEK CRUSHES ALEXANDROVA
Polish second seed Iga Swiatek beat Russian 13th seed Ekaterina Alexandrova 6-3 6-1 to reach the quarters at Flushing Meadows for the third time in her career.
1801 AUGER-ALIASSIME BEATS RUBLEV TO SET UP DE MINAUR CLASH
Felix Auger-Aliassime, who knocked out German third seed Alexander Zverev in the previous round, beat Russian 15th seed Andrey Rublev 7-5 6-3 6-4 to reach the U.S. Open's quarters for the second time.
The Canadian 25th seed next faces Australian eighth seed Alex de Minaur.
1740 DJOKOVIC FACES FRITZ ON FRIDAY
The U.S. Open's quarter-finals kick off on Tuesday with four-times champion Novak Djokovic facing last year's finalist Taylor Fritz.
Three Czech challengers are up against the top seeds in both men's and women's singles, with Marketa Vondrousova facing Aryna Sabalenka, Barbora Krejcikova taking on Jessica Pegula and Jiri Lehecka playing Carlos Alcaraz.
1643 DE MINAUR EASES PAST RIEDI
Australian eighth seed Alex de Minaur cruised past Switzerland's Leandro Riedi 6-3 6-2 6-1 to reach the quarters of the U.S. Open for the third time.
1509 PLAY UNDER WAY
Play began under clear skies in New York, with the temperature around 23 degrees Celsius (73 degrees Fahrenheit).
U.S. OPEN ORDER OF PLAY ON MONDAY (prefix number denotes seeding)
ARTHUR ASHE STADIUM (1530 GMT/1130 AM ET)
25-Felix Auger-Aliassime (Canada) v 15-Andrey Rublev (Russia)
23-Naomi Osaka (Japan) v 3-Coco Gauff (U.S.)
1-Jannik Sinner (Italy) v 23-Alexander Bublik (Kazakhstan)
8-Amanda Anisimova (U.S.) v 18-Beatriz Haddad-Maia (Brazil)
LOUIS ARMSTRONG STADIUM (1500 GMT/11 AM ET)
Leandro Riedi (Switzerland) 8-Alex de Minaur (Australia)
13-Ekaterina Alexandrova (Russia) v 2-Iga Swiatek (Poland)
10-Lorenzo Musetti (Italy) v Jaume Munar (Spain)
