Grigor Dimitrov hailed Kyle Edmund as a deserved winner of their Australian Open quarter-final, before suggesting mental fatigue may have played a part in his own underwhelming display.
The third seed at Melbourne Park, Dimitrov was beaten in four sets by Edmund - a player 46 places below him in the ATP rankings.
However, the Bulgarian was not surprised by Edmund's performance, having twice been taken to three sets by the 23-year-old in recent months.
"Kyle deserves all the respect. He deserved to win, simple as that," said Dimitrov.
"He's been working so hard the past months. I've seen that. [I've] played him a couple of times.
"I take full responsibility of my match today. There's no point for me to say what I did wrong because I can sit here and talk about it, but it's all about him right now. He's the winner."
Dimitrov had come through a gruelling clash with Nick Kyrgios to reach the last eight and acknowledged he had struggled to find his best form in Melbourne.
"From day one I was not playing well," he added. "It took me a lot of work to get back to playing a decent match once again.
"It doesn't matter how fit I am, I think also mentally I was just a little bit tired. With each match, you're draining up. Today was just one of those days that I just couldn't find a way. You have days like that.
"I would say all the matches from Brisbane till now, I don't recall an easy match that I played [in] 1 hour 20 [minutes]. Everything was over two hours, over three hours. For sure that takes a bit of beating on the body, considering that my off-season was pretty short. The only time I actually had off was one week.
"Basically I have not stopped playing since November, which is good. I take that as a positive sign, that the body's been healthy."
Asked to rate Edmund's chances of continuing his dream run, Dimitrov replied: "I think once you reach that stage of a grand slam, anything can happen really. It's really how much you want it.
"These kind of opportunities don't always come on the door. So once you have them, try to make the most out of them."
|BREAKING NEWS: Napoli appoint Ancelotti after Sarri departure|
|NFL stars must stand for national anthem if on field|
|Mascherano laments Romero injury blow|
|´Mr 360´ De Villiers retires after going full circle|
|Ronaldo already a Real Madrid legend like Di Stefano - Nacho|
|Pep or Pepe? The Spanish footsteps Emery could follow|
|Arizona, New Orleans land Super Bowls as NFL draft heads to Nashville|
|Sarri thanked by Napoli chief De Laurentiis amid Ancelotti reports|
|You never know! - Vettel and Hamilton joke about potential Ferrari link-up|
|It´s a silly question - Carrick insists Pogba has Man Utd future|
|Yates protects Giro lead as Viviani takes fourth stage win|
|Ozil one of Arsenal´s biggest talents - Emery|
|Fastest ODI hundred, 278 not out - De Villiers´ best knocks|
|Deschamps: Rabiot has made a huge mistake|
|Arsenal players can challenge for titles, Emery insists|
|Salah can seal Ballon d´Or with Champions League win - Riise|
|I want Real Madrid to lose Champions League final - Alba|
|Leverkusen sign goalkeeper Hradecky|
|Arsenal job a ´dream come true´ for Emery|
|De Villiers hailed as a ´colossus´ after quitting Proteas|
|Benitez expects Lascelles to stay amid reported Liverpool interest|
|Saha tells Martial: Stay and work for Manchester United future|
|Atletico Madrid defender Savic undergoes hip surgery|
|Bess to make Lord´s debut against Pakistan|
|Vissel Kobe announce news conference amid Iniesta speculation|
|Yan Dhanda leaves Liverpool for Swansea|
|Injured Chung out of French Open|
|I wish he´ll come to PSG - Motta wants Buffon reunion|
|Guardiola praises new Arsenal boss Emery|
|Defensive woes, travel sickness and Ozil´s role - Emery´s Arsenal to-do list|
|WATCH: Anthony Joshua serves up Stephen Curry assist|
|De Villiers announces international retirement|
|Salah not comparable to Ronaldo yet - Karius|
|Toure open to Manchester United switch & wants to play with Pogba|
|Rockets backed up fighting talk, says Harden|
|Europa League master, record return at PSG - Arsenal boss Emery in Opta numbers|
|Curry not taking the blame for defeated Warriors|
|Arsenal confirm Emery appointment|
|Bellamy confirms talks with Brisbane Broncos|
|Ref took Champions League final away from Roma - Under|
|Goals galore and sinking City - Liverpool´s road to the Champions League final|
|Benitez: Winning Champions League changed my life|
|Brewers extend Diamondbacks´ losing streak to six|
|Weidenfeller bids farewell in Schmelzer´s last game as Dortmund captain|
|Owen surprised by Zidane success|
|Rockets break Warriors´ 16-game home postseason win streak|
|Bennett keen to see out contract as Broncos target Bellamy|
|Copa Libertadores Review: Silva helps Cruzeiro into last 16|
|Chargers tight end Henry suffers torn ACL|
|WATCH: Harden dunks all over Green|
|Madrid are linked to 50 players – Ronaldo laughs off Neymar rumours|
|Giants sign wide receiver Shepard|
|Salah wouldn´t improve Real Madrid – Del Bosque|
|Stevens says Tatum should´ve been unanimous All-Rookie First Team selection|
|Rodgers on Bryant: If he ends up here, we´ll welcome him|
|Jets´ Hackenberg dealt to Raiders for 2019 conditional pick|
|Mets sign Bautista, start him same day|
|Warriors´ Iguodala ruled out for game four|
|Guzman called up as Romero replacement for Argentina|
|Gaya signs new five-year Valencia contract|
|Celta appoint Antonio Mohamed as new coach|
|Klopp: Real Madrid have no weaknesses|
|Strauss ´stepping away´ from England role to support wife|
|Argentina rule Romero out of World Cup|
|Emery´s website appears to confirm Arsenal appointment|
|´Inspiring´ Guardiola has made Fleetwood a better golfer|
|Two trophies in a week! Torres leaves Atletico Madrid in style|
|I died a thousand deaths - Yates set for Giro defensive after time trial|
|Hamsik hints at Napoli exit amid China rumours|
|Rowett swaps Derby for Stoke|