Evaluating Competitiveness in UEFA's New Champions League Format
arXiv:2508.08290 · doi:10.1515/jqas-2025-0128
Abstract
Recently, UEFA changed the group stage of its international soccer competitions to an incomplete round robin tournament. Previously, teams were divided into groups, each playing a double round robin tournament with a resulting ranking table. In contrast, the new format has all teams competing in one league, producing a single ranking. We investigate the effect of the new format on the number of competitive matches in the UEFA Champions League. A match is non-competitive if the prize for at least one opponent does not depend on the match outcome, or if there exists an opportunity for both opponents to collude; otherwise, we call a match competitive. Using Monte Carlo simulations, we show that the new format results in more competitive matches than the old format.
23 pages
References in corpus (7)
- Quantifying incentive (in)compatibility: A case study from sports
- UEFA against the champions? An evaluation of the recent reform of the Champions League qualification
- Tournament design: A review from an operational research perspective
- Tournament schedules and incentives in a double round-robin tournament with four teams
- On head-to-head results as tie-breaker and consequent opportunities for collusion
- Misaligned incentives in sports: A mathematical analysis of the post-2024 UEFA Champions League qualification
- Ranking matters: Does the new format select the best teams for the knockout phase in the UEFA Champions League?