Answer
During his 14-year career, Barry Bonds led the league in slugging percentage four times, doing so in 1992, 1993, 1997, and 2001. In 1992, he slugged.634, which was a career-high and the second-highest single-season slugging percentage in MLB history at the time. In 1993, he slugged.615, which was the fourth-highest single-season slugging percentage in MLB history at the time.