"I was close to winning, but I didn't play well enough today".
"I told myself to try to be aggressive", said Querrey, who reached the Wimbledon quarterfinals previous year.
"I'm just honestly very happy and blessed that I didn't injure myself that much".
Again in the third set, Rogers appeared to be in a good position as she recovered from a first-game service break and battled to a 3-2, break-point advantage against Kerber. "At the warm-up I kind of twisted a little bit my ankle".
CoCo Vandeweghe, the No. 24 seed, is back into the Round of 16 for the third year on a row after defeating fellow American Alison Riske 6-2, 6-4 in one hour, 15 minutes.
Having claimed the Australian and U.S. Open crowns past year, Kerber has not won a single title this season and struggled for fluency against Flipkens, who tried everything in her power to upset the world number one.
Radwanska next faces Russian eighth seed Kuznetsova, the 2004 USA and 2009 French Open champion, who cruised through with a 6-4, 6-0 win over Slovenian qualifier Polona Hercog. Radwanska was the runner-up at the All England Club in 2012 to - yes, that's right - Serena Williams. She played very well from the first point. Slovakian Magdalena Rybarikova, who knocked out third seed Karolina Pliskova in the second round, dispatched Lesia Tsurenko of Ukraine 6-2, 6-1 and Croatian Petra Martic beat Zarina Diyas of Kazakhstan 7-6 (6), 6-1.
Djokovic, who extended his head-to-head against Gulbis to 7-1, is through to the fourth round at Wimbledon for the 10th time. Canadian sixth seed Milos Raonic, last year's beaten finalist, downed Spain's 25th seed Albert Ramos-Vinolas 7-6 (7/3), 6-4, 7-5 to book a fouth round spot against either Alexander Zverev or qualifier Sebastian Ofner.
The top seed was forced to play on Court 2 on Saturday but refused to make a fuss, despite no men's world No.1 having been seen anywhere but Centre Court or Court 1 this century. It was Djokovic's first full match at the tournament after his first-round opponent retired hurt with the Serb leading 6-3, 2-0.
Kerber was the first to blink in the match as Flipkens mixed up some powerful baseline hitting with a series of well-disguised drop shots to force a break in game six.
Querrey will next face South Africa's Kevin Anderson, whom he leads 7-5 in head-to-head series. 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. Third seeded Federer will face Germany's Mischa Zverev for a place in the last-16.