With Rafael Nadal, Roger Federer, Alexander Zverev and Dominic Thiem having already qualified for the Nitto ATP Finals in London, presenter Seb Lauzier takes a look at those hoping to book their tickets as the Race to London intensifies.We hear from the men who are nearly there, Bulgarian Grigor Dimitrov and Croatian, Marin Cilic, those who are following closely behind in David Goffin and Pablo Carreno Busta and those with an outside chance of qualification including, Sam Querry, Kevin Anderson and Juan Martin del Potro.