Frisco:Chivas USA edged its lead atop Major League Soccer's Western Conference after securing a scoreless draw away to FC Dallas on Thursday.
Chivas is now four points ahead of second-placed Houston with two games to play.
Brad Guzan notched his 12th clean sheet of the season to help Chivas (15-7-6) extend its unbeaten streak to 11 games.
The only goalkeeper with more clean sheets in an MLS season was Tony Meola for Kansas City in 2000.
Dallas (13-5-11) is now four points behind Houston with one game to play, and clear of fourth-placed Colorado, so will finish third.
With each club having already clinched playoff berths, neither displayed much urgency. Dallas' Arturo Alvarez had the match's best scoring chance in the first minute of injury time, drilling a shot from the corner of the penalty box past Guzan and off the near post.
Dallas played the final 10-plus minutes a man down after Bobby Rhine was sent off, apparently for arguing a yellow card issued to Alvarez moments earlier.