Lewis Hamilton dedicated his Russian Grand Prix victory to Jules Bianchi as Mercedes' celebrations at clinching their first Formula One constructors' championship were tempered by thoughts of the man fighting for his life.
Hamilton took full advantage of Nico Rosberg's latest mistake to become only the fourth driver in F1 history to win nine grands prix in a season and extend his title advantage over his team-mate to 17 points.
Rosberg had to settle for being runner-up for the ninth time this campaign, but it was achieved in remarkable fashion given his error on the run-up to the first braking zone at F1's newest track, the Sochi Autodrom, at turn two.
Having slipstreamed Hamilton off the line, Rosberg pulled out and momentarily held the lead, only to out-brake himself and flatspot his tyres, causing a vibration which necessitated an immediate change of rubber.
Dropping to 20th after the stop, Rosberg then astonishingly ran for the remaining 52 laps on the one set of tyres to keep Hamilton in his sights in the championship standings.
It was Mercedes' ninth one-two this season - one short of McLaren's 1988 record - guaranteeing them the constructors' crown.
For Hamilton, there was obvious delight at a fourth successive win, but, once the champagne-quaffing had ended, his thoughts were rightly elsewhere.
With Bianchi in a critical condition at the Mie General Medical Centre in Yokkaichi with brain injuries after crashing into a recovery vehicle at Suzuka, Hamilton opened his heart.
"All week there's been just one person on my mind, and that's Jules," Hamilton said.
"There has been excitement and happiness for the team, but, without a doubt, every time I've got in the car this week, coming here, being here, I've been thinking about him and his family and keeping him in my prayers every day.
"Whether it means anything, or whether it does anything, it would be great to dedicate this to Jules and his family."
Hamilton wins in Russia as Mercedes claim title