Hingis and Mirza last played the Italians in Flushing en route to their second major title of the season, but Errani and Pennetta were on fire to start, breaking serve three times and dropping just 10 points in the opening set.
The top seeds, who had lost their first set since Cincinnati, won a hotly contested second to level the contest, winning just one more point than their experienced opposition to force a match tie-break. With much of the sudden death going with return, Hingis and Mirza proved far more clutch on the key points, earning a 14th straight victory to reach the quarterfinals in Beijing.
Julia Goerges and Karolina Pliskova loom next; the big-hitting pair first teamed up at the Dongfeng Motor Wuhan Open and reached the quarterfinals, falling to to the Chan sisters Yung-Jan and Hao-Ching in straight sets.
Meanwhile, No.5 seeds Katarina Srebotnik and WTA Rising Star Caroline Garcia were hoping to clinch their place at the BNP Paribas WTA Finals Singapore presented by SC Global with a run to the semifinals, but the team will have to wait a little while longer as they found themselves ousted by Chinese wildcards Liang Chen and Wang Yafan, 7-6(3), 6-3. The hometown favorites earned a spot on the National Tennis Stadium on Thursday night when they take on No.4 seeds Timea Babos and Kristina Mladenovic, who qualified for Singapore earlier this week.
A third team through to the quarterfinals was the No.3 seeded team of Casey Dellacqua and Yaroslava Shvedova; the two raced past WTA Rising Star Lara Arruabarrena and Andreja Klepac, 6-1, 6-2. Also already qualified for Singapore, Dellacqua and Shvedova will try to end the hopes of No.8 seeds Andrea Hlavackova and Lucie Hradecka; the two-time major champions need a big result to launch into the Top 8 of the Road To Singapore standings.