#1 Charles Leclerc
For a while, it looked certain that the Monegasque would replace Kimi Raikkonen for the 2019 season, but it now seems like the Finn will retain his seat for yet another year. Leclerc is part of Ferrari's own Driver Academy, but if he feels like they have overlooked him once again in favour of the 39 year old Raikkonen who is almost twice his age he may decide he's had enough of waiting.
If Mclaren can convince him they'll be competitive within a few years, like Renault appear to have done with Ricciardo, then maybe that will be enough to get the 20 year old to sign. Either way, the Mclaren seat would surely be better than another year in the improving, but not destined for great things, Sauber.
Edited by Kishan Prasad