LONDON: Jamie Murray maintained his pursuit of the end-of-year doubles number one ranking with Brazilian partner Bruno Soares as they beat American greats Bob and Mike Bryan 6-3 6-4 at the ATP World Tour Finals on Tuesday. Briton Murray, who with Soares won the Australian Open and US Open titles this year, could emulate younger brother Andy who is in a race with Serbia’s Novak Djokovic to top the year-end singles rankings. French pair Nicolas Mahut and Pierre Hugues Herbert lead the doubles standings but are under pressure after losing their opening match at the Tour Finals in London.