Mercedes boss Toto Wolff says the challenge from Formula 1 rivals Ferrari and Red Bull in 2018 has surpassed the intensity of its title fight with the Scuderia last year.  The German manufacturer faced a serious title threat from a revitalised Ferrari in 2017 but ultimately prevailed to win both world championships, taking 12 victories from 20 races. Mercedes has faced a renewed challenge from Ferrari this year, while an opportunistic victory from Red Bull in China has set-up the prospect of a three-way battle for supremacy with all three outfits appearing evenly matched on pace.  Mercedes lost what looked to be certain victory in Melbourne due to a timing error under a Virtual Safety...
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