Published: Jul 29, 2010 8:24 PM EDT
Updated: Jul 30, 2010 4:30 AM EDT

DAVIE, Fla. (AP) — The Miami Dolphins finally have the go-to receiver they've long sought. They're set at quarterback with second-year starter Chad Henne, and Jake Long returns to anchor the offensive line.

But plenty of other starting positions are up for grabs as training camp begins Friday.

There's a void at free safety, three cornerbacks will battle for two jobs, and the defensive front seven is being revamped following the departures of Jason Taylor and Joey Porter. The offensive line faces a makeover, competition at the receiver spot opposite newcomer Brandon Marshall will be fierce, and even injury-prone Ronnie Brown faces a challenge for playing time at running back.