Enlarge / PARIS, FRANCE - Alen Pajenk #2 of Slovenia serves the ball during the EuroVolley 2019 Final match between Serbia and Slovenia at AccorHotels Arena on September 29, 2019 in Paris, France. (credit: Catherine Steenkeste | Getty Images) A good float serve at just the right moment in volleyball can make or break a tight game, since the ball's trajectory is so tough to predict.