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Farah has surpassed the greats - Salazar
Mo Farah's double gold at London 2012 was the greatest distance running achievement in history, according to his coach Alberto Salazar.
The Briton claimed both the 10,000 and 5,000 metres titles at the Olympic Stadium, and Salazar reckons the level of competition at the moment means the 29-year-old's feat eclipses those of Lasse Viren, who won both crowns in 1972 and 1976, and Emil Zatopek, who also won the marathon in a long-distance treble in 1952.
"I would say that he did it against better competition than has ever been done before," Salazar told BBC Radio Five Live's 'Super Coaches' programme, to be broadcast on Tuesday evening.
"There is clearly no doubt. I know Viren did it twice, I know others did it before that, Zatopek and so forth, (but) distance running now is more competitive by far than it ever has been before.
"It is a much harder thing to medal in distance running now than it was 20 or 30 years ago."