Brad Davis scored the go-ahead goal in the 81st minute and Houston extended its home unbeaten streak to 35 games Sunday with a 2-1 win over Chicago.
Mike Magee scored three times and fellow Irishman Robbie Keane also found the net Sunday in the Los Angeles Galaxy's 4-0 rout of Chicago.
Sherjill MacDonald scored both Chicago goals Saturday and the Fire moved closer to securing a playoff berth with a 2-0 victory over New York.
Chris Rolfe scored two first-half goals Saturday, rallying the Chicago Fire to a 2-1 victory over Columbus.
Alvaro Fernandez and Chris Rolfe scored first-half goals Wednesday and Chicago held on to defeat Toronto 2-1.
Chris Rolfe netted a pair of goals Sunday and the Chicago Fire rolled to a 3-1 victory over Philadelphia.
Steven Lenhart scored late in stoppage time Saturday, elevating the San Jose Earthquakes into a 1-1 draw with Chicago.
Marco Pappa scored in the 58th minute Friday to give the Chicago Fire an unexpected 1-0 victory over Sporting Kansas City.
Gonzalo Segares netted the go-ahead goal in the 68th minute Sunday, propelling the Chicago Fire past Red Bull New York 3-1.
Emmanuel Osei and Shalrie Joseph scored for the New England Revolution Sunday in a 2-1 Major League Soccer playoff win over the Chicago Fire.
United Press International