Roger Federer branded his performance as "average" after missed opportunities cost him in his epic Wimbledon quarter-final loss to Kevin Anderson.
Federer looked to be easing towards the last four after taking the opening two sets against the eighth seed, and even had match point at one stage in the third.
But Anderson survived the scare before incredibly turning the match around, eventually emerging victorious from an absorbing battle of wills as he prevailed 2-6 6-7 (5-7) 7-5 6-4 13-11.
The victory saw him become only the third man to come from two sets down to beat Federer, following in the footsteps of Jo-Wilfried Tsonga and Novak Djokovic, leaving the Swiss to ponder how he allowed the defence of his title to come to an end.
Asked if he knew where he lost control, Federer told a media conference: "I guess there was definitely a moment at some point. Is it missing match points? Is it getting broken at five-all after that? I'm not sure.
"That could have been a key. Could have been a key later. There's a lot of little points here and there that always make a difference in the outcome of a match. I don't think this one naturally you can pinpoint exactly, except my match points.
"I was very happy that I got off to the right start of the match, was able to take control somewhat of the game. I just don't know exactly how I couldn't create more opportunities once the third set came around.
"I think I had chances, I'm not sure exactly how many. But then fourth and fifth, obviously the fifth was long, that's like two sets, the fifth.
"He was consistent. He was solid. He got what he needed when he had to. Credit to him for hanging around really for that long.
"It's just not one of my best days, but they don't happen very often either. It's one of those average days you have to try to win the match, and I just couldn't get it done. So it's disappointing."
Put to Federer that the loss gives him unfinished business to come back to the tournament in 2019, he responded: "Of course, the goal is to come back here next year. I wouldn't call it unfinished business. I felt like I did some good business here in the past already."
|Thomas drops shot as McIlroy endures testing morning|
|Hazard is Chelsea´s best player and we need him – Fabregas|
|BREAKING NEWS: Mercedes & Bottas agree multi-year deal|
|Neymar backs ´genius´ Ronaldo to make Serie A great again|
|Sanchez to face San Jose Earthquakes as Mourinho grows desperate in attack|
|Ibrahimovic to watch England at Wembley – Zlatan will honour Beckham bet|
|Cubs use five-run fifth inning to trump Cardinals|
|Manchester United 1 America 1: Mata salvages draw for Red Devils|
|Steelers´ Super Bowl window getting smaller - Brown|
|Neymar cares about PSG and will stay amid Real Madrid speculation|
|NFL, NFLPA at ´standstill agreement´ over anthem policy|
|Guardiola: It would´ve been a mistake for Jorginho to join City|
|Angels star Ohtani cleared to resume pitching|
|´I don´t give a f***´ – Cousins hits back at critics after Warriors move|
|Merritt leads Barbasol Championship|
|Ruud awakening for Ferrer in Bastad|
|Nibali withdraws from Tour de France with back fracture|
|Fabinho: I´ll try to convince Mbappe to join Liverpool|
|Beating Messi boosted France´s World Cup belief – Lloris|
|Carnoustie saving the worst until last|
|McIlroy´s youthful exuberance could be a bad sign for Carnoustie contenders|
|Saints triumph at second-placed Wigan|
|Anfield atmosphere sweetened Alisson on Liverpool|
|Bouchard reaches Gstaad quarter-finals|
|´What are you waiting for?´ - Alisson reveals Salah text messages|
|´Full package´ Alisson could not be missed - Klopp|
|Alisson to Liverpool: Brazil star becomes most expensive goalkeeper in history|
|Alisson to Liverpool: Brazilian´s stats blitz Mignolet, Karius|
|Liverpool sign Alisson in world-record deal|
|The Open 2018 diary: Spieth´s got ball skills as Finau proves the scratch golfer|
|Woods: Score doesn´t reflect how well I played|
|Can we go to Paris now? - Thomas in a hurry after conquering Alpe d´Huez|
|Thomas: I could have finished stronger|
|Kisner shines at baked Carnoustie as McIlroy, Rahm and Thomas loom|
|Sarri´s mentality made me a better footballer - Jorginho|
|Tax rates played a role in Ronaldo joining Juventus, says LaLiga president|
|Aggressive McIlroy doing it his way, not the fairway|
|I let him have it - Spinazzola ribs Ronaldo over Juve shirt number|
|Thomas makes it back-to-back wins|
|Ramos may remain for Spain but Luis Enrique promising surprises|
|Cazorla still playing through pain after Villarreal appearance|
|Vegas to Carnoustie - a hellish trip for Jhonattan|
|NFL training camp 2018: Five under-the-radar rookies to watch|
|Woods off to a flyer as Thomas charges|
|Sanchez given green light to join Man Utd tour|
|Greipel, Groenewegen and Gaviria latest sprinters to abandon Tour de France|
|Luis Enrique hopeful over Pique as he plots a Spanish evolution|
|I had a brain fart - Spieth disappointed with missed opportunity|
|I´ve sacrificed too much to quit, says injury-plagued Rossi|
|Klopp rejects Henderson´s plea to return early to Liverpool training|
|Open champion Spieth loses ground in scrappy finish|
|Alexis Sanchez hints visa issue sorted as United States trip beckons|
|Kovac an admirer of Pavard, expects James to stay|
|Dzeko happy at Roma and eyeing silverware|
|Eels win basement battle with Bulldogs|
|Kluivert to follow Totti´s example after taking ´big step´ with Roma|
|Kisner hopes to return Claret Jug favour to Spieth|
|FIBA bans 13 players & two coaches over Philippines-Australia brawl|
|Spieth and Rahm in the mix as Kisner sets the target|
|Monchi insists Roma remain ambitious as Liverpool close in on Alisson|
|Cavendish thanks ´race that shaped career & heart´ after cruel Tour exit|
|No Trent Bridge Ashes Test as England confirm schedule|
|Ajax tell Barcelona not even ´insane´ money will buy De Ligt, De Jong|
|Hamilton agrees two-year Mercedes extension|
|Uran withdraws from Tour after failing to shake off injuries|
|Spieth tees off Open defence|
|Zidane has shown no will to coach France, insists FFF president|
|Risking the curse - Steelers star Brown lands on Madden 19 cover|
|Pogba silenced his critics with World Cup displays – Ibrahimovic|
|Warburton overwhelmed by support following retirement|