Five key storylines in F1 2019: Can anyone stop Hamilton?

With 2018 already consigned to the history books, attentions are beginning to switch towards the new Formula 1 season. 

The eve of a grand prix season always provokes excitement and 2019 is no exception. With the most dramatic driver market in recent memory altering the look of the grid and a revised set of regulations offering the prospect of a greater spectacle, the upcoming campaign is shaping up to be one of the most intriguing in years. 

Ahead of the season-opening Australian Grand Prix in Melbourne - which takes place in just 73 days - we’ve picked out five of the biggest topics that are likely to define the 2019 F1 season.

Click below to find out our selections...