Pete Alonso plans to opt out of his Mets contract and test free agency after the season finale against the Marlins, ending a year in which he produced 38 homers and a .272/.347/.524 line with 42 extra-base hits. New York’s postseason miss puts the 31-year-old on a high-stakes market, with the Mets weighing 2026 payroll and defensive tweaks around Mark Vientos. Fantasy managers should note the timing and potential landing spots as bargains could emerge late in the winter.