The 2018 Topps Baseball Opening Day Checklist is an important resource for baseball card collectors and fans alike. It provides a comprehensive list of all the cards released in the series, including their rarity, value, and condition. Additionally, it can help collectors identify which cards they need to complete sets, as well as provide a platform for trading or selling duplicate cards. Having the checklist available, it helps ensure that collectors can keep track of their collections more accurately and efficiently.