answer:Each team supplies the footballs they use, although they are made by the same company and to NFL specification. Each team is responsible for inflation its own balls. And there are different balls for kick offs and field goals and Point-afterTouchdown. In baseball, the home team provides the umpires with enough balls for the game; the umpires mud the balls before the game to make the baseball less slippery when throwing. I believe in tennis the tournament provides the tennis balls. Golfers use their own balls that meet USGA spec. Each golfer marks his ball, usually with a felt pen, to identify it.