EntityQ903416· pop 5· linked from 2,022 articlesOpening DaySign in to saveThe day on which professional sports leagues begin their regular seasonConnectionsLos Angeles AngelsEntityCleveland GuardiansEntityUnited StatesCountryJapanCountryMexicoCountryAustraliaCountryCanadaCountrySouth KoreaCountryTokyoCityGeorge W. BushPersonLos AngelesEntitySydneyCitySeoulCityBill ClintonPersonPuerto RicoConceptCOVID-19 pandemicEntityX (social network)ConceptHarry S. TrumanEntityWoodrow WilsonEntitybaseballEntityCategoriesAnnual events in Major League BaseballApril observancesBaseball terminologyInfobox holiday (other)Infobox holiday with missing fieldMajor League Baseball competitionsMajor League Baseball cultureUnofficial observances