Mo Farah reflected on an "incredible" journey and said he had left everything on the track after his final race at a major global event ended in disappointment with a second-placed finish in the IAAF World Championships 5000 metres.
Farah was looking to add the 5000m title to the 10,000m crown he claimed in London last weekend and complete a distance double for the fifth successive major championship.
However, the Briton - who is set to shift his focus to road running - had to settle for a silver medal on Saturday as Ethiopia's Muktar Edris proved strongest on the final lap.
"It's very special ... it's been a long journey, but it's been incredible," Farah told BBC Sport.
Asked whether the 10,000m had impacted on his hopes of winning the 5000m, the 34-year-old said: "To be honest with you, it takes so much out of me. It's not an excuse, but it took a lot more out of me than I realised.
"Tactically, I was trying to cover every move and they [Edris and Ethiopian team-mate Yomif Kejelcha] had a gameplan. One of them was going to sacrifice himself, and that's what they did.
"The better man won on the day, but I gave it all. I didn't have a single bit left at the end.
"I've got a few more races planned - after that I want to take a break and see what I could do on the road. But this chapter is closed."
A delighted Edris performed Farah's trademark 'Mo-bot' celebration after claiming victory, but insisted his actions were borne out of respect for the defending champion.
"I was highly prepared for this race and I knew I was going to beat Mo Farah," said Edris. "After the 10km he was maybe tired so he did not have enough for the last kick. I was stronger.
"Mo has many victories but now I have one. I am the new champion for Ethiopia. That's why I did the Mo-bot. I am the next champion.
"I have won the gold in front of his home crowd. I didn't have much support but we did it. I did the Mo-bot out of respect as well for him."
|Valverde does ´not see any problem´ with Suarez´s sour substitution reaction|
|Hamilton dominates in Austin as title moves into view|
|Ignore the noise, says under-fire Ozil|
|It´s like playing against aliens - Inter´s Spalletti hails Napoli players after draw|
|PSG duo Alves and Lucas to miss Marseille clash|
|CAF Champions League Review: Wydad Casablanca book final berth|
|Saracens survive Ospreys scare, Clermont win marred by Lopez injury|
|Getting there - Murray posts positive update on comeback from injury|
|Napoli 0 Inter 0: Handanovic heroics put an end to Partenopei´s winning streak|
|Barcelona 2 Malaga 0: Controversial win sees hosts extend LaLiga lead|
|Kvyat set for showdown talks with Red Bull boss Marko|
|Weidenfeller to end Dortmund stay at end of season|
|Pellegrino wants patience from Southampton saviour Boufal|
|Sad day for democracy - Guardiola gives latest take on Catalan crisis|
|Heynckes awaiting news on Muller injury|
|It was a penalty - Silva hits back at Burnley boss Dyche|
|Hamburg 0 Bayern Munich 1: Tolisso sends Heynckes´ men joint-top|
|Southampton 1 West Brom 0: Boufal stunner ends Saints´ winless run|
|Appleton still happy in caretaker role after Leicester sink Swansea|
|Guardiola ready to dine out on Aguero record|
|All Blacks squad safe despite Wallabies defeat - Hansen|
|They should do a press conference to explain – Mourinho furious with Manchester United players|
|Bosz bemoans dropped points after Dortmund let two-goal lead slip|
|Montella calls for courage against Genoa|
|Championship Review: Wolves stay top as Terry scores for Villa|
|One of my proudest moments – Wagner revels in Manchester United win|
|Dimitrov sets up Del Potro final as London spot edges closer|
|Damage was done in the first half, admits Hughes|
|Garcia moves into pole position at Valderrama|
|Conte will ´never´ fear the Chelsea sack|
|Herrera questions Manchester United´s ´passion´|
|Benitez impressed by Newcastle´s perseverance after narrow win|
|Hope stands alone as Zimbabwe skittle Windies on day one|
|Monaco 2 Caen 0: Keita opens account as hosts get back on track|
|A bad team deserves punishment – Mourinho blasts Manchester United display|
|Zidane rejects tag of ´world´s best coach´|
|Stoke City 1 Bournemouth 2: Howe´s men pick up first away points|
|Manchester City 3 Burnley 0: Aguero levels record as Guardiola´s men stretch lead|
|Swansea City 1 Leicester City 2: Mahrez shines as Appleton enjoys winning start|
|Newcastle 1 Crystal Palace 0: Merino leaves it late to sink Eagles|
|Huddersfield Town 2 Manchester United 1: Mourinho´s men suffer first defeat as Lindelof error proves|
|Eintracht Frankfurt 2 Borussia Dortmund 2: Bosz´s men stunned by comeback|
|Sri Lanka´s T20 squad depleted amid safety concerns|
|Double delight for Germany as Goerges and Witthoeft lift WTA titles|
|Immobile, Strakosha pen Lazio extensions|
|Beaten Read credits clinical Wallabies|
|Conte hails Chelsea´s ´desire to fight´ for Watford comeback|
|Aguero becomes joint-top scorer in Manchester City history|
|Chelsea hero Batshuayi relieved to end ´difficult moment´ against Watford|
|Verratti admits he had doubts over PSG project|
|Cheika sets sights high after All Blacks win|
|Bartomeu offers assurances over Barcelona´s LaLiga status|
|AC Milan will sell ´top players´ if they miss the Champions League|
|Chelsea 4 Watford 2: Batshuayi, Azpilicueta spare champions´ blushes|
|Darren Fletcher makes 100th consecutive Prermier League appearance|
|Carrasco´s attitude not a problem, says Simeone|
|Allegri happy to win ugly at Udinese|
|Barcelona approve €897million budget following record revenue in 2016-17|
|Lineker´s Benzema criticism embarrassing - Zidane hails Madrid striker as ´the best´|
|Bayern Munich announce record €640m turnover|
|Gasly denied chance of Super Formula title by typhoon|
|Australia claim long-awaited win over All Blacks|
|A-League Review: Brillante completes comeback in thrilling Sydney derby|
|Bakayoko starts for Chelsea against Watford|
|Not many teams can stop us scoring – Smalling hits back after United criticism|
|Halep relishing world number one battle in Singapore|
|Bakayoko: I´m not Chelsea´s new Matic|
|Manchester United fan Werner still dreams of Premier League move|
|Tigers lose Tamim for rest of South Africa tour|
|Manchester City playing like Brazil, says Jesus|