Kerber enjoyed a superb 2016, winning both the Australian and US Opens as well as rising to the top of the WTA rankings. Switzerland's Bacsinszky required treatment on a thigh problem prior to the final set, and was evidently struggling as she lost 3-6, 6-4, 6-1.
Already a set down, Kerber faced a break point at 2-4 in the second, but raised her game in the nick of time to claim a 4-6 7-6 (7-2) 6-4 triumph and book a last-16 meeting with Muguruza.
After past year being the first woman apart from Williams in a decade to contest three grand slam finals in a season, German Kerber has struggled for form and confidence in 2017.
She will next play the Spaniard Garbine Muguruza, the 2015 runner-up, who breezed through with victory over Sorana Cirstea.
In other fourth-round matches, all on Monday, Radwanska meets two-time major champion Svetlana Kuznetsova, former No. 1 Victoria Azarenka will play second-seeded Simona Halep, sixth-seeded Johanna Konta will face Caroline Garcia, French Open champion Jelena Ostapenko goes against No. 4 Elina Svitolina, No. 5 Caroline Wozniacki plays No. 24 CoCo Vandeweghe, and Magdalena Rybarikova will meet Petra Martic.
Gas Prices Falling in Time for Holiday
For some travelers, the low gas prices are nice but aren't causing them to travel anymore than they otherwise wouldn't. But Dan McTeague, senior petroleum analyst for GasBuddy.com, said the drop in gas prices may soon be coming to an end.
"I'm feeling pretty good", she said.
"It was for sure a really important win for me today, especially because it was a really up-and-down match", Kerber said. I'm happy the way I'm playing out there.
Djokovic will next face Adrian Mannarino, who defeated fellow Frenchman and No. 15 seed Gael Monfils 7-6 (3), 4-6, 5-7, 6-3, 6-2 in three hours, 30 minutes. I think I was serving as well better in the third set. "I have to be aggressive, as well, and try to play my game from the first ball that we hit. When you're there, you're fighting till the last point".
Tsonga, a Frenchman seeded 12th, began the second installment of the match serving at 5-6 in the fifth set, and buckled on the eighth point after the resumption, going wide with a forehand to hand Querrey, an American who is the 24th seed, a 6-2, 3-6, 7-6 (5), 1-6, 7-5 victory in a match lasting nearly three hours.
Top seed Angelique Kerber and ninth seed Agnieszka Radwanska scraped into the Wimbledon last-16 on Saturday, while Jo-Wilfried Tsonga and Gael Monfils bowed out of the men's tournament after five-set defeats.