Evening notes: Chargers hitting hard

Posted by ESPN.com's Bill Williamson

SAN DIEGO -- Wrapping up a Sunday night in the AFC West:

The Chargers looked very crisp in their first practice in full pads this training camp. The team flew around the field and there was very good contact made. San Diego coach Norv Turner was pleased with the effort.

Safety Steve Gregory, who is fighting for playing time, played very well Sunday evening. He had an interception and broke up some passes.

Cornerback Quentin Jammer continued to look impressive.

It was a mixed day for Oakland's receivers. Veteran Javon Walker reportedly looked very good working out on his own during practice. Three of Walker's past four seasons have been altered by injuries. If Walker can have a bounce-back year, it will be a huge boost for Oakland, which is hungry for solid receiver play.

Meanwhile, top pick Darrius Heyward-Bey continued to have trouble holding onto the ball. His hands are a major concern. Oakland owner Al Davis talked to Heyward-Bey after the practice. Heyward-Bey's development will be closely monitored.

In Denver, receiver Brandon Marshall did not practice in the evening. He left the morning practice with an apparent hamstring injury.

Three more starters are back on the practice field in Kansas City after they failed the team's conditioning test Friday.