Weekend off-days are a rare occurrence in MLB three-game series, as scheduled rest days typically fall on Mondays or Thursdays, allowing matchups to run uninterrupted through the weekend in most cases.An unusual scheduling situation has appeared in the series between the St. Louis Cardinals and the Kansas City Royals. (Getty Images via AFP)However, an unusual scheduling situation has appeared in the series between the St. Louis Cardinals and the Kansas City Royals.Sat. Louis vs Kansas City gets a breakAfter playing the opening game on Friday, both teams will take a break on Saturday before returning to action for the second game of the series on Sunday night, creating a rare weekend gap in the schedule.Reason behind weekend interruptionThe reported reason behind the unusual weekend off-day in the series is Kansas City’s role as a host city for FIFA World Cup matches this year.On Saturday, Ecuador and Curacao are scheduled to play at Arrowhead Stadium, the usual home venue of the Kansas City Chiefs. FIFA is temporarily using the stadium to host World Cup matches this summer, and the timing of this Group E fixture clashes with the St. Louis Cardinals vs Kansas City Royals series.Since Arrowhead Stadium and Kauffman Stadium sit next to each other and share the same parking area, hosting both events at the same time would create major logistical challenges, making it difficult for games to run concurrently or even on the same day.