Definitely. Humans play the game. If several players on a team are feeling good, seeing the ball well, throwing the ball well, and healthy all simultaneously, then sure, a team can have momentum. All we're basically saying is a team is playing well and is growing more confident as they continue to do so. Nothing outlandish about that. There is such a thing as adreline, and I also agree that it's generally easier to see in a basketball or football game where pure motion and 'burst' plays more of a factor; in baseball, you're basically stationary 90% of the time. And yea, momentum is all nice and good until you run into Santana or Webb or whomever.