CARSON, Calif. - An opportunity for the Union to regain first place in Major League Soccer's Eastern Conference disintegrated with just seconds left to play Sunday night.

Chivas USA's Juan Pablo Angel scored in the 90th minute to force a 1-1 tie that kept the Union in second place with three games to play.

"It definitely stings," said midfielder Justin Mapp, who scored the Union's goal. "We let two points get away, and, obviously, things are very tight in the playoff race."

The draw, combined with Columbus' 2-1 victory over D.C. United, put the Union (10-7-14) into a tie with the Crew for second place. Both teams are one point behind Sporting Kansas City and one point ahead of Houston.

But the Union have one game in hand over Kansas City, Columbus, and Houston.

"Every point is valuable at this stage," Union team manager Peter Nowak said. "Everything is wide open."

Mapp put the Union ahead in the 59th minute with a leftfooted shot from 26 yards that bounced between the right post and diving goalkeeper Dan Kennedy.

Mapp, making his first start since Sept. 3, scored for the first time in more than four months. The midfielder scored twice in the Union's 6-2 win at Toronto on May 28.

Chivas USA (8-12-12) had a chance to tie in the 63d minute, when former Union forward Alejandro Moreno took a 7-yard shot that hit the left post.

Then, with 44 seconds left before stoppage time, Angel scored his sixth goal in the last four games. Michael LaHoud chipped a cross from the lower-right corner of the penalty area to Angel, whose 5-yard header glanced off the left hand of goalkeeper Zac MacMath.