The mark consists of three-dimensional trade dress for baseball entertainment services comprising the combined visual appearance of a substantially darkened baseball stadium environment featuring illuminated foul lines extending from the home-plate area along the first-base and third-base sides of the field; illuminated outlines of first, second, and third bases; illuminated rectangular boundary lines forming the two batter's boxes; fluorescent or luminescent shirts, caps, and pants worn by baseball players and other on-field participants; a fluorescent or luminescent baseball bat; an umpire wearing a luminescent shirt; and fluorescent or luminescent clothing and handheld accessories distributed throughout the surrounding spectator areas. These illuminated and luminescent elements appear in combination as shown in the drawing and contrast with the substantially darkened stadium environment. The broken or dotted lines depicting the conventional baseball field configuration, stadium structures, seating areas, aisles, railings, the scoreboard, lighting towers, and unclaimed portions of player and spectator bodies indicate the position and environment of the mark and are not part of the mark. Any shading or stippling represents visual contrast, illumination, or depth and does not indicate a particular color. Color is not claimed as a feature of the mark.