Clayton Kershaw and the Los Angeles Dodgers agreed on a seven-year, $215 million deal on January 15th. With an average 30.7$ million per year salary, this is the highest paying contract in the history of professional baseball:
Clayton Kershaw LAD ('14-20) $30,714,286
Roger Clemens NYY ('07) $28,000,022
Alex Rodriguez NYY ('08-17) $27,500,000
Justin Verlander DET ('13-19) $25,714,286
Alex Rodriguez NYY ('01-10) $25,200,000