In a recent study at the University of Minnesota, we evaluated the biomechanical changes induced by and the usability of a novel tennis racquet design. During tennis play, high vibration transfer after ball impact from a tennis racquet to the player causes discomfort to the player, and is considered to reduce performance and fasten the onset of muscle fatigue. The newly designed racquets used a vibration dampening technology called as countervail. Racquets with countervail technology were found to vibrate less after ball impact. Initial evidence indicates that it may delay muscle fatigue, which was associated with increased ball placement accuracy.