Not since Jo Durie and Sara Gomer achieved the same feat in 1987 has Britain seen such talent in the women's game with Watson and Robson now ranked 47th and 50th respectively.
Watson broke into the world's top 50 for the first time in 2012 after winning her first WTA singles title at the Japan Open in October, the first Briton to do so since Gomer in 1988.
Robson on the other hand has risen a staggering 81 places in just over a year, thanks largely to her run at the US Open back in September where she reached the fourth round.
And on top of her performance alongside Andy Murray at London 2012, winning mixed doubles silver, the 18-year-old was also named WTA Newcomer of the Year in November.
Watson and Robson will be hoping to improve on their performances from last year at the upcoming Australian Open, both suffering first-round exits.
Watson does however face a race against time to be fit after withdrawing from the Moorilla Hobart International warm-up event due to an elbow injury.