The Arizona Diamondbacks dropped $100 million in valuation to $1.7 billion, ranking 18th in MLB, per Forbes 2025 data. Owner Ken Kendrick faces margin compression from a $140 million payroll against flat local revenues—Phoenix market revenue sits below median for competitive teams. MLB valuations contracted 2.3% league-wide in 2024, but Arizona's decline outpaces peers due to aging infrastructure at Chase Field and competition from market saturation in Southwest region. The franchise must drive sponsorship uplift or explore stadium modernization to reverse trajectory.