The 34-year-old fly-half missed Ireland's shock 19-12 defeat by hosts Japan in Shizuoka on Saturday, which threw Pool A wide open, with a knock he suffered in the opening 27-3 win over Scotland.
Spurs have struggled to find consistency this season after an unsettling summer transfer window during which key players including Christian Eriksen were linked to moves that never materialised.
Bekele left it late to hit the lead, overtaking countryman Birhanu Legese on the 38th kilometre before hitting top speed as he chased the world record of 2:01:39 set in Berlin last year by Kenyan Eliud Kipchoge.
Team chief Toto Wolff admitted that Mercedes did not have the quickest car at the Sochi Autodrom, but had won thanks to some luck, good strategy and a never-say-die belief in their chances.
Sonny Bill Williams calls it being honest with each other when they put their competitiveness aside to analyse each other's performance in Tests and training.