Nico Rosberg, who won his first Formula One Championship after beating his Mercedes team-mate Lewis Hamilton, announced his retirement on Friday.
The 31-year-old clinched the title after finishing second in the final race of the season in the Abu Dhabi Grand Prix.
The reactions to his sudden retirement were largely those of shock but many of his peers congratulated him on a spectacular career.
Here, we list the best tweets following the announcement.
Wow @nico_rosberg retiring as a World Champion..actually what a great way to end a great career. Enjoy your family time.— Johnny herbert (@johnnyherbertf1) December 2, 2016
Extraordinary news from @nico_rosberg... Come on Toto! Do a deal with Mclaren and get Fernando back - now that will be entertaining!!
— Karun Chandhok (@karunchandhok) December 2, 2016
Incredible news about @nico_rosberg retiring from F1. Very brave making that decision.— Juan Pablo Montoya (@jpmontoya) December 2, 2016
“I’ve made it”.— Bleacher Report UK (@br_uk) December 2, 2016
Nico Rosberg on his shock retirement from F1 pic.twitter.com/gWgoot6xiS
— Ralph (@Ralph_E_S) December 2, 2016
Big respect 👏🏻
— Kevin Magnussen (@KevinMagnussen) December 2, 2016
— Marcus Ericsson (@Ericsson_Marcus) December 2, 2016
FINAL STATS: NICO ROSBERG
— Formula 1 (@F1) December 2, 2016
Formula One world champion Nico Rosberg has announced he is retiring from the sport with immediate effect.
Rosberg, who claimed his maiden title at the season-deciding race in Abu Dhabi last Sunday, made the shock revelation at a press conference in Vienna.
"I have decided to end my Formula One career here," Rosberg, 31, said.
The German driver announced his shock retirement in this video posted on Mercedes AMG Petronas' official YouTube channel.
What do you make of Rosberg's decision to retire?
The final version of the 2017 F1 calendar sees a clash avoided with Le Mans but has lost the German Grand Prix from the original schedule.
As was the case in 2016, the first draft of the calendar saw the European Grand Prix in Baku scheduled to take place on the same day as the Le Mans 24 Hours. However, following a request from the Baku race organisers, the race – renamed the Azerbaijan Grand Prix – has now been pushed back by a week to avoid a clash and also prevent a repeat of the difficult Canada-Azerbaijan back-to-back of this year.
With the race in Baku being pushed back a week, the following rounds in Austria, Great Britain and Hungary also do the same. This is facilitated by the German Grand Prix dropping off the calendar altogether, with Hungary now the last race before the summer break on July 30.
In the latter part of the season, tweaks to the previous draft see Singapore host the first flyaway race after the Italian Grand Prix, with a two-week gap before Malaysia and Japan as was the case this season.
Further tweaks also mirror this year’s calendar with the United States and Mexico once again becoming a back-to-back pairing before the Brazilian Grand Prix, which is confirmed following doubts earlier this year. The season will finish with the Abu Dhabi Grand Prix on November 26.
The calendar was ratified during a meeting of the World Motor Sport Council in Vienna on Wednesday.