While ’98 was the top season of McGwire’s career, Sosa would go on to have a much better — dare I even say all-time great caliber? — year in 2001, with 10.1 WAR. But both players were extremely productive during the period in and around 1998.
Noting that Sammy Sosa's best season was 2001 with 10.1 WAR, much better than his more famous 6.8 WAR season in 1998.