キュウ 
たま 
() ball () sphere
                        
きゅう (n) (1) (math) sphere, (suf,ctr) (2) counter for balls (in baseball)
きゅうい (n) (pitcher's) stuff
きゅうかい (n) the baseball world
きゅうぎ (n) ball game (e.g. baseball, tennis, soccer)
きゅうきん (n,adj-no) coccus
きゅうじょう (n) baseball stadium
きゅうだん (n) baseball team

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Etymologies: 中文字譜 : 説文解字