What corner(s) or segment do you find the most difficult to get perfect and why?

For me it's defiantly the hairpin after the long straight at Dubai Grand Prix. I have problems finding the brakepoint, speed is high and you can go far out in the sand.

runner ups are "the esses" chicane at Mount Panorama where I always seem to drift and "paddock hill bend" at Brands Hatch for speed management.