American John Isner fell out of the ATP Top 10 this week, bypassed by Canada's Milos Raonic.
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In addition, France's Richard Gasquet moved from 10th to ninth in the most recent rankings.
Isner's fate was sealed when he was booted in the second round at Houston last week by No. 101 Dustin Brown of Germany. Last year, Isner won the clay court tournament, and reached the finals in 2012.
Brown, meanwhile, rose to a career-hight ranking of 87 by reaching his second quarterfinal of the season in Houston.
Outside of the Top 10, 30-year-old Spaniard Guillermo Garcia Lopez leapt 15 spots to No. 38 by winning the title at Casablanca over countryman Marcel Granollers.
It's just the third career title for Garcia-Lopez, and his first since Bangkok in 2010. With his move up, Spain now has 10 players ranked in the Top 50, easily the most of any one country (France is second with eight).
Outside the top 50, another Spaniard was making his first big move, as 21-year-old Roberto Carballes Baena jumped 87 spots from 273 to 186 on the strength of his first career semifinal in Casablanca. Remarkably the Spaniard had never played a tour-level match before last week.