ball, sphere
球 centers on a round, three-dimensional object: a ball or sphere. The idea is a solid, curved shape used in play or geometry.
球 combines 王 (jade, precious stone) with 求, which likely contributes the sound. The original meaning was a beautiful stone or gem, later extended to a ball or sphere by shape association.
The left side 王 looks like a precious round jewel, and the right side 求 suggests something sought after. Picture a perfectly round gemstone that you want to hold and play with like a ball.
For キュウ, imagine a ball shaped like the letter Q: Q -> キュー, and the round Q-shape cues the reading キュウ.
Earth; the globe
baseball
sphere; globe; ball; bulb
table tennis; ping-pong
baseball team
baseball stadium; ballpark
Ryukyu; chain of southwestern Japanese islands comprising Okinawa Prefecture
light bulb
pitching; throwing a ball; bowling (in cricket); pitched ball
base on balls; walk; pass
straight ball (pitch)
hitting (a ball with a bat, racket, golf club, etc.); batting; batted ball; struck ball
balloon (hot-air, weather, etc.); blimp
breaking ball (pitch); curve ball; screwball
ball game (e.g. baseball, tennis, soccer)
white blood cell; leukocyte; leucocyte
throw
pitch that hits the batter
the baseball world
coccus
Earth globe (model); terrestrial globe
pitcher's first pitch (to batter, or in the game)
fastball
(pitcher's) control
(pitcher's) stuff
bases on balls and pitches striking the batsmen
fly (ball)
tennis
winning pitch
professional baseball
on Earth; on the earth
global warming
combination of (varied) pitches, serves, etc.
baseball club (at a university, corporation, etc.); baseball team