List of highest-paid Major League Baseball players
Major League Baseball (MLB) does not have a hard salary cap, instead employing a luxury tax that applies to teams whose total payroll exceeds certain set thresholds for a given season. Free agency did not exist in MLB prior to the end of the reserve clause in the 1970s, allowing owners before that time to wholly dictate the terms of player negotiations and resulting in significantly lower salaries.
Source: Wikipedia — List of highest-paid Major League Baseball players (CC BY-SA 4.0)