Sebastian Vettel may have moved to within touching distance of Lewis Hamilton in the 2015 championship fight courtesy of his victory in Hungary, but can he really crash Mercedes' party? It's by no means the biggest deficit an eventual champion has faced at the half-way stage of a season - even Vettel himself has come back from a worse position, as we reveal in our look back at six of the most dramatic championship reversals in Formula One racing history...

Kimi Raikkonen, 2007
18 points (26 percent) behind Lewis Hamilton at mid-season
The Iceman snatched the title from under the noses of McLaren duo Lewis Hamilton and Fernando Alonso in 2007, but he had to come from a long way back. By the halfway stage he trailed Hamilton by 18 points (under the 10-8-6-5-4-3-2-1 scoring system), with his task looking all the more difficult given the Briton had finished on the podium in each of the opening nine races.

Sebastian Vettel, 2012
44 points (29 percent) behind Fernando Alonso at mid-season
The history books show 2010-13 being Vettel's era, but in truth his run of four straight world championships was far from straightforward - and 2012 was when it all almost unravelled. A record seven different winners from the opening seven Grands Prix of the year made for a remarkably close title race early on, but by mid-distance Vettel had fallen away, trailing Ferrari's Fernando Alonso by 44 points (greater than the margin he trails Hamilton by this year).

Nelson Piquet, 1981
11 points (30 percent) behind Carlos Reutemann at mid-season
Boasting seven different winners, and five drivers all within one victory of being champion, 1981 was one of the most dramatic seasons in history (quite aside from the politics that dominated in the background). It also delivered the first of Nelson Piquet's three F1 crowns, but the breakthrough came about the hard way.

Niki Lauda, 1984
11.5 points (32 percent) behind Alain Prost at mid-season
It became clear early on that McLaren were destined for silverware in 1984. Which of Alain Prost or Niki Lauda would claim the honours, however, was far less certain. Prost took a record-equalling seven wins over the 16-race calendar (Lauda claimed five), and also led by 11.5 points at the halfway mark. In the end though it was the Austrian who triumphed, and by just half a point - the closest margin in history.

James Hunt, 1976
38 points (50 percent) behind Lauda at mid-season
Eight years earlier, it was Lauda's turn to be on the losing side of a title turnaround, although his breath-taking bravery and determination would shape his legacy in ways title glory never could. James Hunt meanwhile would come from behind to claim the title in the final round, his rivalry - and comradeship - with Lauda becoming the stuff of legend.

John Surtees, 1964
20 points (67 percent) behind Jim Clark at mid-season
The 1964 championship has gone down in legend, with John Surtees becoming the first - and still only - man to win world championships on two and four wheels. But it also remains, in percentage terms at least, the biggest comeback in F1 history.