 Murray won his first ATP title in San Jose in February |
Andy Murray has risen to 21 in the latest world rankings after his run to the semi-finals of the Toronto Masters. The 19-year-old Briton, who lost to France's Richard Gasquet on Saturday, was ranked 132 this time last year and started 2006 at 64 in the world.
He will be seeded at a Grand Slam for the first time at this month's US Open.
Murray will take on Tim Henman in the first round of the Cincinnati Masters on Tuesday, with Roger Federer the likely opponent in round two.
Henman has moved up one place in this week's rankings to number 59, while Greg Rusedski slips a huge 55 spots to 127.
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Andre Agassi has pulled out of the Cincinnati event because of ongoing back problems. The 36-year-old American, an eight-time Grand Slam winner, plans to retire after next month's US Open.
Agassi has fallen to 37 in the rankings and is unlikely to be seeded at Flushing Meadows.