For Ito, it was her first Top 50 win to advance to her first WTA Tour quarterfinal. She notched the victory by capturing five of nine break opportunities to win 56 per cent of her return games.
Also posting wins Wednesday were Clara Tauson of Denmark, Germany's Eva Lys, Suzan Lamens of the Netherlands and Australian Kimberly Birrell.
Ningbo Open
Fifth-seeded Daria Kasatkina of Russia came back from a set down for a 1-6, 6-3, 6-2 win over Czech Katerina Siniakova to reach the quarterfinals in China.
Neither woman put on a serving clinic during the match, which lasted just over two hours, with Kasatkina winning 56 per cent of her service points to Siniakova's 52. Both players had chances, with Kasatkina taking six of 14 break opportunities and Siniakova five of 15.
Spain's Paula Badosa, the eighth seed, came from behind to defeat Wang Xiyu of China 6-7, 6-1, 6-2, Russia's Mirra Andreeva dispatched Tamara Korpatsch of Germany 6-0, 6-4 and Yulia Putintseva of Kazakhstan defeated Ella Seidel of Germany 6-4, 6-4 to move to the quarterfinals.
Czech Karolina Muchova outlasted Australian Olivia Gadecki 6-3, 7-5 in the day's lone first-round matchup.
