The ornamental design for a gameracket, as shown and described.
FIG. 1 is a front perspective view of a game racket showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is another perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof; and,
FIG. 10 is a perspective view thereof, the broken line showing is included for the purpose of illustrating unclaimed subject matter and forms no part of the claimed design.