As the match went on, I gave it my all.
This is his best run at Wimbledon since that 2015 success as he lost in the third round in 2016, and then retired hurt in the quarter-finals against Tomas Berdych 12 months ago.
Anderson is the first South African man to make the last four at Wimbledon since Kevin Curren in 1983.
"Do you think I ruined the court?" he bellowed at Ramos.
"It's a pretty exciting opportunity to play Federer here at Wimbledon", said Anderson, who has never beaten the 20-time Grand Slam champion in four attempts. That compared with an average of 78 percent in the third and fourth sets, providing the spine that propped up his comeback on Court 1. "But he will have to serve so well all the time to beat Federer, and hit his forehand well". "But I have been there before, I knew what energy I needed to bring into the fifth set", the Swiss said, "But it can happen, against a player like him who serves so big". "Beating Roger Federer here at Wimbledon will be one I remember, especially in such a close match", Anderson said.
Wednesday's other quarter-final sees 2016 runner-up Milos Raonic tackle U.S. ninth seed John Isner, making his Wimbledon last-eight debut at 33.
Like a vintage Rolls Royce, Federer cruised into the last eight for a mind-boggling 16th time with another imperious centre court display at The All England Club.
Since he exited Wimbledon at the first-round stage past year, Anderson has enjoyed a solid return, making four finals, including his deep run at the US Open where he finished runner-up to Rafael Nadal.More news: Putin and Netanyahu meet for Syria-focused talks in Moscow
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The 36-year old will meet eighth seed Kevin Anderson in the quarterfinal on Wednesday.
Earlier in the day, three-time champion Novak Djokovic reached his eighth Wimbledon semifinal with a 6-3, 3-6, 6-2, 6-2 win over Japan's Kei Nishikori in a stormy Centre Court clash.
The Ottawa native and partner Yifan Xu of China, the tournament's sixth seeds, defeated the unseeded pair of Bethaine Mattek-Sands of the USA, and Lucie Safarova of the Czech Republic 5-7, 6-4, 6-2 in a quarter-final on Wednesday.
The great players find a way to win even when they are not playing their best but for once Federer could not do it.
"I'm feeling the ball well".
The Swiss lost the set in a flurry of aces, with Anderson's relentless, powerful serve sending the match into a decider.
Isner is hoping he might have some presidential support should he reach the semi-finals, with Donald Trump due to visit the United Kingdom later this week.
"I am peaking at the right moment".
Many are already anticipating a Sunday final between Federer and Nadal, 10 years after their 2008 epic championship showdown widely regarded as the greatest final ever played.