We claim the ornamental design for a central portion of a racquet, as shown and described.
FIG. 1 is a front view of a racquet including a central portion;
FIG. 2 is a first side view of the racquet of FIG. 1;
FIG. 3 is a second side view of the racquet of FIG. 1;
FIG. 4 is a bottom view of the racquet of FIG. 1;
FIG. 5 is a front, first side perspective view of a central portion of the racquet of FIG. 1.
FIG. 6 is a front, second side perspective view of the central portion of the racquet of FIG. 1; and,
FIG. 7 is a front view of the central portion of the racquet of FIG. 1.
The ornamental design that is claimed is shown in solid lines in the drawings. The dashed lines shown in FIGS. 1 through 7 are included for the purpose of illustrating environmental elements only and form no part of the claimed design.