Sabalenka made it three straight wins and six straight sets against Olympic gold medal winner Zheng Qinwen.

American No. 1 Taylor Fritz  fended off Alexander Zverev 7-6(2), 3-6, 6-4, 7-6(3) firing into his first Grand Slam semifinal at the US Open.

Emma Navarro came "ready to rock" and rolled into her maiden major semifinal sweeping six straight games to stop Paula Badosa 6-2, 7-5 at the US Open. 

Top-seeded Sinner has now won his last 12 sets at the US Open.

Beatriz Haddad Maia beat Caroline Wozniacki 6-2, 3-6, 6-3 to become the first Brazilian to reach the US Open quarterfinals since Maria Bueno 56 years ago.

Jessica Pegula stopped Diana Shnaider 6-4, 6-2 to return to join Emma Navarro as the second American woman into the US Open elite eight.

Quarterfinals commence on Day 9 - here's what we'll be watching in Flushing Meadows.