Casey Stoner led from start to finish on Sunday to win the Czech Grand Prix and extend his lead in the MotoGP championship standings to 60 points with six races to go.
The 21-year-old Australian went around the 5.4km Brno circuit on his Ducati in 43 minutes, 45.810 seconds to win his seventh race of the season.
"Today was just perfect. I've always liked this circuit a lot," Stoner said. "I plan to win some more races."
John Hopkins of the US finished a career-best second on his Suzuki, followed by another American, defending champion Nicky Hayden on a Honda.
Starting from pole position for the third consecutive race, Stoner pulled away from the rest of the field on the first lap and then kept increasing his lead.
Valentino Rossi of Italy, second in the standings after 11 races, finished seventh, citing a problem with his rear tire.