Format
The First and Second Rounds reduced the 35 entrants to 24 and 12 teams, respectively. The remaining 12 teams were then placed into three Third Round groups of four, with the top two teams in each group advancing to the Fourth and final qualification group. The Third Round began in August 2008 and ended in November 2008. The top 3 teams from the Fourth Round group of 6 (held from February to October 2009) qualified for the 2010 FIFA World Cup. The 4th place team competed in a home-and-away playoff against the 5th-place team from CONMEBOL.
Read more about this topic: 2010 FIFA World Cup Qualification (CONCACAF)