Each year there is at least one or two bubble teams that do not make it into the NCAA tournament, as expected by college basketball analysts.
Players that are on the bubble may start the season in Minor League Baseball in hopes of making the MLB team in the future.
The reason for this is because each NFL roster consists of fifty-three players, which makes the coaches' decision often fairly easy.
The NBA has by far the fewest people that are considered to be on the bubble; this is because each team only has thirteen players on the roster.
If a bubble player does not make the team, they may be sent down to the G League in hopes of one day being called up to the professional level.
Hockey has a little bit bigger of a roster compared to other professional sports, which makes it hard to have so many players on the bubble.