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Inside Minor League Baseball's experimental rules: Oversize bases, robot umps and moving the mound

Minor League Baseball finally returns to ballparks across the country, with Tuesday marking the first games since 2019 after all of last season was canceled because of the COVID-19 pandemic.

Opening Day will feature 55 contests across four levels, though not every team that took the field two years ago will be returning to the diamond in 2021.

Major League Baseball streamlined the minor leagues, contracting 40 teams in the process. All 30 MLB teams will now have four levels of affiliates: low-A, high-A, Double-A and Triple-A -- plus a rookie level team housed at each spring training complex.