Most September call-ups will sit on major league benches for the last month of the season, called up to fill in as pinch runners, mop-up relievers or to give starters a day off.
However, a few youngsters have come up to find themselves in the lineup and making an impact.
Most of these players are not worth starting. Most of them are not worth owning in standard leagues, but in deep leagues, every starter has value. Those in the midst of hot streaks have the chance to earn even more at-bats.
At the end of the day, during fantasy playoffs, luck favors the creative.
Here are five new big leaguers who could make a significant difference when it counts.