As the dust settles on Rafael Nadal’s retirement, the question arises: where does the great Spaniard rank among the best players of all time? VENUS WILLIAMS Years active: 1994-present Grand Slam singles titles: 7 Tour titles: 49 Weeks as world No1: 11 Only her sister prevented her finishing far higher up this list. MARTINA NAVRATILOVA Years active: 1974-2006 Grand Slam …