FIG. 1 is a front perspective view of a first embodiment of a sport undergarment.
  
    FIG. 2 is a front elevation view of the sport undergarment shown in FIG. 1.
  
    FIG. 3 is a rear elevation view of the sport undergarment shown in FIG. 1.
  
    FIG. 4 is a left side elevation view of the sport undergarment shown in FIG. 1.
  
    FIG. 5 is a right side elevation view of the sport undergarment shown in FIG. 1.
  
    FIG. 6 is a front perspective view of a second embodiment of a sport undergarment.
  
    FIG. 7 is a front elevation view of the sport undergarment shown in FIG. 6.
  
    FIG. 8 is a rear elevation view of the sport undergarment shown in FIG. 6.
  
    FIG. 9 is a left side elevation view of the sport undergarment shown in FIG. 6.
  
    FIG. 10 is a right side elevation view of the sport undergarment shown in FIG. 6.
  
    FIG. 11 is a front perspective view of a third embodiment of a sport undergarment.
  
    FIG. 12 is a front elevation view of the sport undergarment shown in FIG. 11.
  
    FIG. 13 is a rear elevation view of the sport undergarment shown in FIG. 11.
  
    FIG. 14 is a left side elevation view of the sport undergarment shown in FIG. 11.
  
    FIG. 15 is a right side elevation view of the sport undergarment shown in FIG. 11.
  
    FIG. 16 is a front perspective view of a fourth embodiment of a sport undergarment.
  
    FIG. 17 is a front elevation view of the sport undergarment shown in FIG. 16.
  
    FIG. 18 is a rear elevation view of the sport undergarment shown in FIG. 16.
  
    FIG. 19 is a left side elevation view of the sport undergarment shown in FIG. 16; and,
  
    FIG. 20 is a right side elevation view of the sport undergarment shown in FIG. 16.
  Any showing of the environment by broken lines having equal length segments is for illustrative purposes only and forms no part of the claimed design. The portions of the sport undergarment shown in broken lines having unequal length segments illustrate the boundary of the claimed design and form no part of the claimed design.