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Players on the roster bubble have two objectives. They must either prove that they are better at their position than others competing for the same roster spot, or they must prove that they can offer value in other ways (mainly on special teams).

Players who can accomplish one (or both) of those two things could find themselves on the right side of the roster bubble. Players who do not accomplish either will probably find themselves looking for work at the end of summer.

The Miami Dolphins are holding some tight training-camp battles this summer; whether it's young players getting their first real chance to make an impact or veterans getting their last chance to prove they still have what it takes to play at the NFL level.

The Dolphins can't be bashful about making tough decisions, as this could be head coach Joe Philbin's last chance to prove he can take the Dolphins over the hump.

Here are some players who need to prove they have what it takes to get the Dolphins to that spot.