finished in 8th - the same position she achieved in both the 5,000m and 10,000m at the Olympics.
ran an impressive race in the men's 8km, leading for three laps before being overtaken with 400m to go.
USA's Bobby Mack won the race ahead of Ayad Lamdassem of Spain, in a reversal of last year's top two.
Despite being overrun in the end Humphries was pleased with his performance.
Meseret Defar wins 5,000m
He said: "That's where I want to be, challenging the world's top athletes."
Great Britain's junior women had given their team a real chance of victory in the second of the four races that counted towards the team's total. The top six finishers were British with
winning ahead of Jess Judd, with Rebecca Weston in third.
was the top British finisher in the junior men's race in fourth.
In an invitation women's 3km race, Ethiopian
showed her potential on the senior stage, winning the race ahead of
Olympic 5,000m champion Meseret Defar
, also of Ethiopia.
Dibaba, the 2010 world junior champion over 5,000m, is the younger sister of three-time Olympic champion Tirunesh Dibaba.
finished sixth for Great Britain with
, the 2009 world silver medallist over 1500m, just behind her in seventh.
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