Jamie Murray has made history as the first Briton under the modern ranking system to become a world number one.
The 30-year-old Scot, Andy Murray's older brother, will officially take top spot in the doubles rankings on Monday, replacing Brazil's Marcelo Melo.
Murray is the first British world number one since Virginia Wade achieved the honour in doubles in 1973.
However, no Briton has previously topped the computer rankings introduced by the ATP and WTA during the 1970s.
Murray gained his first Grand Slam doubles title in January, winning the Australian Open alongside Brazilian partner Bruno Soares.