Jamie Murray set to become first Briton ranked as world No1 doubles player

• Scot will overtake Marcelo Melo when rankings are updated on 4 April
• Johanna Konta through to the last 16 at the Miami OpenJamie Murray is set to become the first Briton to become world No1 doubles player in the official rankings, despite being knocked out of the Miami Open in the first round with his current playing partner, Bruno Soares.When the rankings are updated on 4 April Murray, 30, will have five points more than the current No1 Marcelo Melo who, playing alongside Ivan Dod