Sunday's Formula 1 news roundup: Christian Horner, Nico Hulkenberg, Valtteri Bottas

Sports Mole rounds up all of the latest news regarding Formula 1 on Sunday, September 22.

Sunday morning's headlines:

Mercedes needs update to catch Ferrari - Hamilton Ferrari's rivals are surprised by the Italian team's pace in Singapore. Read more.

Teams to discuss 'open source' parts idea for 2021 Formula 1 teams are still squabbling with Liberty Media and the FIA over the proposed rules for 2021. Read more.

F1 drivers slam sprint race qualifying idea Formula 1 drivers have slammed a proposal to radically shake up the qualifying format. Read more.

Haas eyes Kubica for reserve driver role Haas boss Gunther Steiner has expressed interest in signing up Robert Kubica for 2020. Read more.

Formula E teams showing 'interest' - Hulkenberg Nico Hulkenberg is no longer completely ruling out a switch to Formula E. Read more.

Kvyat not in running for Albon's seat - Marko Alex Albon looks to be on pole position to keep his seat at Red Bull for 2020. Read more.

Sebastian Vettel brands reverse grid proposal "bulls**t" F1's American owners Liberty Media have staged talks with the teams about revamping qualifying in a bid to spice up the show. Read more.

Charles Leclerc takes pole in Singapore Lewis Hamilton qualified second ahead of Sebastian Vettel. Read more.

Grosjean not sure why reputation so bad Romain Grosjean says he is not sure why his reputation in Formula 1 is not so great. Read more.

Symonds denies 2021 cars to be 6 seconds slower F1 teams have expressed concern about the latest version of the 2021 technical rules. Read more.

Three-race trial for qualifying races in 2020 Christian Horner says the current qualifying format "works fine". Read more.

Bottas accepts Wolff's recent criticism Valtteri Bottas says he is determined to catch up with Lewis Hamilton in the areas in which he is lacking. Read more.

Kvyat not ruling out Red Bull return Daniil Kvyat is not writing off his chances of returning to Red Bull in 2020. Read more.

F1 must learn from Hubert-Correa crash - Green Formula 1 must learn from the crash that killed Anthoine Hubert and left fellow F2 driver Juan Manuel Correa seriously injured. Read more.

Williams eyes Latifi, Hulkenberg for 2020 Claire Williams has named at least two drivers who are on Williams' driver shortlist for 2020. Read more.

Hulkenberg turns down McLaren Indycar offer Nico Hulkenberg has turned down an offer to drive for McLaren in the British marque's first full Indycar season next year. Read more.

Hulkenberg thinks shyness hurt F1 career Nico Hulkenberg thinks shyness might have held him back in Formula 1. Read more.