I do not believe in momentum in sports in the traditional sense.
For starters, that sense — which seems to me to reduce a bunch of complex factors to the idea that things going in one direction continue going in that direction unless acted on by an outside force — seems more properly described as inertia. And as the theme song to Bill Nye the Science Guy and my two trips through AP Physics — shout out to Coach Skip! — and taught me, inertia is a) a property of matter b) by which (matter) continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.