Adrian Mannarino saved a match point in a 5-7, 7-6(4), 6-3 upset of top-seeded Andrey Rublev avenging his loss to the Russian in the 2019 Moscow final.

Maric Cilic broke serve four times dispatching Tommy Paul 7-5, 6-3 to cruise into the Kremlin Cup quarterfinals for the fourth time.

The 20-year-old plans to finish 2021 strong.

World No. 63 Maria Camila Osorio Serrano won the final four games toppling top-seeded Elina Svitolina 5-7, 6-3, 6-2 to reach the round of 16 in Tenerife. 

Aryna Sabalenka won six straight games stopping Ajla Tomljanovic 7-6(2), 4-6, 6-1 to move into the Moscow quarterfinals in her Kremlin Cup debut.

Tennis is all about improvements. Which ATP players made them the best in 2021?

Halep eased past Anastasia Potapova while Ons Jabeur retired down a set to Ekaterina Alexandrova.