Rangers shortstop Marcus Semien wears a custom double strap Nike Diamond batter’s elbow guard. The color scheme matches Texas’ grey uniforms perfectly. He also has “510” written on one of the straps. We assume it references the area code of his hometown in San Francisco.
Most of the features on this guard are exclusive; the double strap design, the personalization options, and the custom colorway. You can still get Nike Diamond batter’s elbow guards, but only the stock version, at DicksSportingGoods.com for $30.