Lewis Hamilton hasn't won the 2017 Formula 1 world championship, and he might yet lose it to Sebastian Vettel. Should Hamilton succeed, it will be the greatest of what will then be four title victories. And if he doesn't, either he'll have thrown it away or suffered some remarkable misfortune.
To claim this could become his best title win is not to say the others were in some way unworthy. But it reflects a confluence of conditions and performances, some within Hamilton's power to influence and others entirely outside of that.
Cast your mind back to July and things weren't going especially well for Hamilton. Having lost a surefire victory, and ground to Vettel in the title fight, thanks to a loose headrest in Azerbaijan, Hamilton finished only fourth in Austria after picking up a grid penalty for a gearbox change while his rival was a close second to Valtteri Bottas.