A ground ball is struck on around 45 percent of batted balls. On around 34% of batted balls, a fly ball is hit. In 2015, the league average was 1.32. The league average HR/F ratio was 11% last season. A good ground-ball to fly-ball ratio is important because it means less damage is done by way of home runs. Generally, if you want more power, go with a higher fly ball percentage; if you want better defense, go with a lower ground ball percentage. There are exceptions (such as when one outlier player dominates either category), but that's generally how it works. There are many factors that go into determining a batter's ground-ball or fly-ball percentage. Weight plays a role: Heavy hitters tend to be more fly-ball oriented while lighter hitters have more power from the ground. So, if you have the opportunity, try to match up against a heavier hitter. Also consider the weather: If it's dry or not, hot or cold, overcast or sunny, those factors can influence what kind of ball players see and swing at. Finally, make sure you're keeping track of the correct statistics. Grounders don't need to be touched by a fielder to count as a ground ball, so long as they aren't hits or flies.