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NBA draft boards are still in flux at the moment. With the combine behind us and the first major group workout completed, teams are now moving into individual workouts -- the last stage of a process that began several years ago for most prospects.

Individual workouts afford teams the chance to get up close and personal with players. They get to see prospects go head-to-head with each other, get private interviews and even get to take them out to dinner. It's the equivalent of a final exam for a prospect.

Fail it, and your chances of getting drafted plummet. Ace it, and you might hear that team call your name. We've talked about a number of lottery and mid-first-round prospects for the past week. Right now, based on conversations with a number of NBA GMs, the top 23 players on our Big Board look like first-round locks.

However, another 20 or so players are firmly planted on the dreaded first-round bubble. What they do in the coming workouts will determine whether they get one of those last, coveted, two-year guaranteed contracts or whether they slip into more uncertain territory in the second round.

Here's a closer look at each of those prospects and what they'll have to do to sneak into Round 1.

To see which prospects are on the first-round bubble and how they can sway teams in their favor over the next three-plus weeks, you must be an ESPN Insider.