In a tightly contested 1-1 draw in Kansas City, Chivas USA head coach Preki singled out opposition goalkeeper Kevin Hartman's performance.
Preki said, "We played a really good first half. We were all over them and felt it was only a matter of time we were going to score a goal.
"But I'll give [Wizards goalkeeper] Kevin Hartman a lot of credit. In the key moments, we weren't as clinical [as necessary] in the final third.
"We find ourselves down on a simple play. Claudio Lopez has the quality that he can hurt you in those moments, and he certainly did. We could have easily thrown the towel [in]."