The Dynamo (1-0-2, 5 points) played a spectacular 4-4 tie with Pumas in Mexico City three weeks ago and is just a point ahead of third-place Luis Angel Firpo (1-1-1, 4 points). Kei Kamara and Craig Waibel each scored two goals for Houston in a thriller that featured seven goals in the first half and none in the last 40 minutes. Kamara will probably get a start again, since he is suspended for the Dynamo's MLS finale Saturday night against Chivas USA at Home Depot Center.
All four teams in the group -- Panamanian club San Francisco FC (0-2-2, 2 points) is the other -- still have a shot at the quarterfinals.
The Dynamo is playing the last of five straight games at home. Since losing to New England in the SuperLiga final on penalties Aug. 5, it has won eight games, tied five, and lost only one in league and CCL competition.