Mo Farah wins 10,000m at world championships

(Photo: Kirby Lee, USA TODAY Sports)BEIJING (AP) — Rarely has Mo Farah been challenged like he was Saturday.

The combined might of the Kenyan team was working to sap his strength and a stumble in the chaos of lapping runners on the last go-round made this year’s 10,000-meter race at the world championships truly memorable.

It almost put a summer of doping allegations hitting his coach and training partner into the back of his mind.

Yet again on Saturday, there was no denying Farah, who is halfway home to a third long-distance double in as many major championships.

“To back it up year after year, it hasn’t been easy,” the British runner said, reflecting on a 5,000-10,000 double at the 2012…