I was just very happy that I was able to protect my serve, find a way to break, create opportunities.
Although Federer is approaching peak form, he knows world number one Rafael Nadal - yet to drop a set in his first three matches - and three-time Wimbledon victor Novak Djokovic - playing his way back to his best this week - are lurking as potential final opponents.
But Federer offered a contrasting view in his media conference following a 6-0 7-5 6-4 fourth-round win over Adrian Mannarino on Monday.
Wimbledon's first week has been characterised by a set of stunning performances and phenomenal upsets.
But it's business as usual for Federer as the defending champion took his consecutive sets won at Wimbledon to 29 in a third-round dismissal of Germany's Jan-Lennard Struff.
At 4-3, 40-30, Federer hit a 118 miles per hour ace to hold and start his roll that included the last five points he served in the first set, all 20 in the second, and then the first 10 of the third. His decision to skip the French Open this year, for instance, helped him keep his legs for Wimbledon.
No. 7 Karolina Pliskova became the last of the top-10 seeds to be knocked out, losing to Kiki Bertens of the Netherlands.
Serena Williams is back in the Wimbledon quarterfinals for the 13th time after beating Russian qualifier Evgeniya Rodina 6-4 6-2.
Querrey's fellow American Madison Keys, seeded 10th, celebrated US Independence Day with a 6-4, 6-3 win against Thailand's Luksika Kumkhum.
Slipping and sliding to defeat after defeat, the top 10 seeds in the women's singles nearly entirely made a bodge of the first three rounds.
Seventh-seeded Pliskova didn't face a break point as she cruised through a meeting of the two former No.1-ranked players on Centre Court. She beat the ninth-seeded Venus Williams in the third round after coming from a break down in the third set. It was the first time the eight-time Wimbledon champion had worn the brand publicly, but organizers said he didn't violate any of their strict rules in regards to using the tournament for marketing purposes.
Croatian world number 55 Donna Vekic followed up her shock success against fourth seed Sloane Stephens with a 7-5, 6-4 victory against Sweden's Rebecca Peterson.
The 29th-seeded Buzarnescu beat Katie Swan of Britain 6-0, 6-3, clinching the match with a backhand victor on No. 3 Court.
The 28-year-old Nishikori is the first Japanese man to reach the quarter-finals at Wimbledon since Shuzo Matsuoka in 1995. The players are going to look up in the crowd and not understand what's going on at Wimbledon. The No. 1 seed won an astounding 35 straight points on serve before finally having the streak snapped late in the set.
Having missed Wimbledon past year due to her pregnancy, Serena is on a 17-match winning streak at the All England Club. After the review confirmed the ball landed on the line, umpire Juan Zhang of China awarded the point to Cibulkova.
Two-time Australian Open champion Azarenka was vulnerable on her second serve throughout, winning just seven of 18 points on it.