Mercedes' Valtteri Bottas says his inability to get the better of Lewis Hamilton and win a race this year has begun to take its toll.
Renault technical director Nick Chester says the team have been "fired up" by the signing of Daniel Ricciardo for 2019.
Stoffel Vandoorne says he will "give everything" in the final races of the campaign after it was confirmed he will leave McLaren.
Sauber driver Charles Leclerc has been confirmed as Kimi Raikkonen's replacement at Ferrari for the 2019 season.
Max Verstappen and Daniel Ricciardo don't believe Red Bull can dominate as much as they did at Monaco in May at Singapore this weekend.