2009–10 Euroleague
Professional basketball competition

The 2009–10 Euroleague was the 10th season of the Euroleague, a professional basketball competition for elite clubs throughout Europe organised by Euroleague Basketball Company, and it was the 53rd season of the premier competition for European men's clubs overall. The regular season featured 24 teams from 13 countries.
This season marked the first time since 2001–02 season that a qualifying round was used to determine the last two teams for the regular season. The qualifying round started on September 29, 2009, while the regular season of the Euroleague started on October 15, 2010. The season ended with the Euroleague Final Four, which was hosted at the Palais Omnisports de Paris-Bercy in Paris, France, with the final on May 9, 2010.
Format
For the first time in the modern Euroleague era, a preliminary stage was used to determine the last two teams in the regular season. 8 teams competed in qualification rounds, of which the 2 winners advanced to the regular season stage. Those teams joined 22 teams that had qualified directly to the regular season stage.
Allocation
A maximum of three teams could qualify from any one country through their league position. However, 14 clubs held Euroleague Basketball A-linceces, which gave them automatic spots in the Euroleague Regular Season until 2011–12, regardless of their domestic league finish.
The public source identifies “2009–10 Euroleague” as professional basketball competition. This brief keeps that definition visible, then builds a research path around Euroleague, Professional and basketball.
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