HOUSTON -- D.C. United goalkeeper Louis Crayton made two saves, including one in the last minute of second half stoppage time, to salvage a 0-0 tie against Houston on Sunday night.

Houston (11-5-11) extended its lead over Chivas USA to two points in the Western Conference and is unbeaten in ts last six matches.

D.C. (10-14-4) remained winless in its last seven matches but held its ground in the Eastern Conference. D.C. trails New York and Kansas City by two points for fourth place in the East.

Houston had a chance to score in the 95th minute when Corey Ashe crossed a pass to Dwayne De Rosario on the right box, but De Rosario's header toward the lower post was stopped by Crayton.

Marc Burch had D.C.'s lone shot on goal in the seventh minute, while De Rosario had the Dynamo's only shot on goal in the first half in the 16th minute.

The match got heated in the second half with seven yellow cards being issued in the span of 20 minutes, culminating in D.C.'s Bryan Namoff being sent off with his second yellow card in the 73rd minute. D.C. played the final 20 minutes down a man.