I claim the ornamental design for a saddle rack, as shown and described.
FIG. 1 is a top perspective view of a saddle rack showing my design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a left side view thereof showing a conventional horse saddle rested atop the saddle rack.
The broken lines in FIG. 9 represents a conventional horse saddle rested atop the saddle rack and are for environmental purposes only and form no part of the claimed design.