lobber

/ˈlɑbər/
noun
  1. A person who throws or hits a ball in a high, slow arc, especially in sports like tennis or baseball.
    • In the baseball game, the pitcher was a lobber who relied on slow curves.
    • The lobber on the tennis court surprised everyone with her soft, high shots.
    • The coach told the lobber to vary his throws to keep the batters guessing.