u200bEven though it isn't something you can actually see, momentum is a real thing. In fact, momentum can be the difference between getting eliminated in the first round and winning the World Series. In baseball, a team on a run tends to make all the right moves, get all the breaks, and get the key hit, defensive play, or strikeout when they need it the most. The confidence level is high, and teams can thrive as a result of it.
Even though the current Wild Card system is setup to penalize the teams by making them pitch their ace prior to the Division Series, it actually can create momentum for whichever team advances.