The London Kings were a professional baseball team that played on Earth in the 21st century. They were a Major League baseball team as early as 2015, and a part of the Planetary Baseball League by 2025. (DS9 Season 1 production art)
In 2025, they once again acquired Bokai from Seibu as the third baseman. He was the Planetary League's greatest hitter for 2025 and 2026. In 2026, Bokai broke Joe DiMaggio's consecutive hitting record. (TNG: "The Big Goodbye"; DS9: "If Wishes Were Horses"; DS9 Season 1 production art)
It is unknown if the team was based out of London in the United Kingdom or based out of London, Ontario, Canada. It is possible, however, that baseball becomes a more global game in Star Trek, given that the Kings play in the Planetary Baseball League.