Britain's Andy Murray will be the dominant force in tennis now he is world number one, Tim Henman says.
The Scot is the first British singles player to reach the top spot since computerised rankings began in 1973.
"I don't think Andy was ever going to settle for second best," former British number one Henman told BBC Radio 5 live's Sportsweek.
"Now he's reached number one I don't think for any moment in time he's going to take his foot off the gas."
Henman added: "If Andy stays fit and healthy I can see him being the dominant force going forward.