The camp battles begin Thursday when the Ravens hold their first full-squad training camp practice at the Under Armour Performance Center in Owings Mills. The final 53-man roster will be decided four preseason games and five weeks of practice later, but more than half of those roster spots are likely already spoken for.

We know that -- health permitting -- marquee players such as Ray Lewis, Ray Rice and Joe Flacco will be on the squad in Week 1. We can assume the same for top draft picks like Courtney Upshaw and Kelechi Osemele.

On the other hand, late-round draft picks, rookie free agents and less prominent veterans will each try to secure one of the leftover roster spots during those steamy late afternoon practices in July and August. Those battles will provide the drama until the games count in the standings, starting Sept. 10 at M&T Bank Stadium.

I’m sure we will hear at some point this summer that no roster spot is guaranteed. But these ones probably are. Here is a position-by-position projection of which players we feel are locks to make the Ravens out of camp.

-- Matt Vensel