Elena Rybakina, this year's Australian Open champion, has the opportunity to claim the World No. 1 ranking from Aryna Sabalenka at the US Open. The 27-year-old will secure the top spot if she reaches the semi-finals, regardless of other results.
Meanwhile, American player Madison Keys secured the first set against Korneeva with a 7-5 victory on Arthur Ashe. Keys, who previously led 3-0 in the set, was broken back before ultimately prevailing.
Elsewhere at the tournament, play on courts without covers has been delayed until at least midday New York time, which is 5pm BST, due to rain. Matches scheduled for these courts include Rybakina against Thea Frodin, and Belinda Bencic facing Yulia Putintseva.
In other ongoing matches, Cobolli is trailing Comesana by two sets to one, with Comesana leading 6-3, 5-2. Cobolli managed to hold serve in the third set, reducing his deficit.