By my rough count, there are currently eight free agent second basemen who have posted at least one 2+ fWAR season since 2017. My rough counting has also revealed that there are currently three free agent second basemen who have posted at least one 3.5+ fWAR season in since the start of 2017, with Jed Lowrie actually having done so in each of the last two seasons.
In fact, those subsets might jump to nine and four, respective, if the Milwaukee Brewers proceed with a non-tender of Jonathan Schoop, which The Athletic’s Ken Rosenthal suggests is very legitimate possibility prior to Friday’s non-tender deadline.