(Adnkronos) "New fight against the institutions of tennis signed John McEnroe. Present in London on the occasion of the Laver Cup, the former captain of the Team World reopened the debate on the disproportion between the millionaire collections generated by the four Grand Slam tournaments and the percentage actually destined for the protagonists in the field. To break the current balance [...] L'articolo The provocation of McEnroe: "Players shou…