The Canadian-born Briton, whose world ranking has climbed one place to No 53, beat the South African, 6-3, 3-6, 6-3. It was the first time this year that Rusedski had beaten a player in the world's Top 10.
"I was on top from the start," said Rusedski, the British No 2, whose powerful serve and volley game kept Ferreira on the run. The defeat ended Ferreira's chances of qualifying for the season-ending ATP Tour Championships in Hanover later this month.
British No 1 Tim Henman, who plays his first-round match in the Kremlin Cup against Byron Black in Moscow today, must pick up his game as Rusedski has done. His ranking has slipped from 25 to 28 after two successive first-round defeats.Reuse content