The 26th-ranked Spaniard fought back to win 5-7, 6-4, 6-3 and will play Daniil Medvedev or Rafael Jodar in the final.
The Belarusian’s exit follows top seed Rybakina losing to unseeded Charaeva in her first match as world number one.
Italy’s Jannik Sinner has not played since Wimbledon win in July, missing US Open and ongoing ATP 500 event in Beijing.
World number 18 Eala was beaten 3-6, 6-3, 6-2 by 85th-ranked Xiyu, who will face compatriot Zhang Shuai in the final.
The 39-year-old will step back onto the court for a competitive match on Wednesday for the first time since the US Open.
Athletes transported to the wrong venues, three matches in 18 hours and an accommodation crisis add to organisers’ woes.
The 25-year-old Italian has not played since capturing his fifth major title at Wimbledon in July due to a knee injury.
From Olympic champions to teen sensations, several athletes are looking to make their mark at the continental event.
National lawmakers propose paying her fine should WTA impose it on her for skipping the concurrent mandatory China Open.
Germany’s Alexander Zverev beats American Ben Shelton 6-3, 7-6 (2), 5-7, 6-2 to win the men’s singles title in New York.
