Observation deck: Chiefs-Rams

A look at the Chiefs’ 31-17 loss at St. Louis on Saturday night:

This performance wasn’t as smooth as the preseason opener for the Chiefs.

The biggest issue was that the first-team defense allowed two touchdowns in the first quarter.

Offensively, starting quarterback Matt Cassel put together his second strong preseason performance, completing 13 of 18 passes for 142 yards.

Here’s the deal, folks: Preseason games don’t matter much, but Cassel is looking good and that’s paramount for the Chiefs. Cassel engineered his second long scoring drive of the preseason. A good Cassel in the regular season will mean a good season for the Chiefs.

The Kansas City Star reported that starting safety Kendrick Lewis had his arm in the sling and suffered a shoulder injury on the same arm that shelved him for a time last season. Lewis is an up-and-comer. It would hurt if he misses time.

Kansas City had four turnovers in the game, including three lost fumbles.

Brady Quinn was more effective than Ricky Stanzi, who replaced Cassel. Quinn likely took another step toward securing the backup job.