No. 1 – Bret Boone
It’s a bit easy to overlook Bret Boone as a Mariners player. He played with the team during a time Seattle had great superstars like Edgar Martinez and Ichiro Suzuki.
Plus, Boone played 14 years in the majors and while half of them were in Seattle, that time was split up between the first two years of his career and then his return from 2001 through part of 2005.
But Boone also had the best years of his career in his second stint with Seattle. In 2001, Boone had 141 RBIs, the fourth highest in Mariners history. He won three Gold Gloves and was an All-Star twice. Boone was an All-Star in only one other year during his career. He also finished third in MVP voting in 2001.
2001 was a special season for Boone and the Mariners. Seattle won 116 games that year. Boone hit .331, had an on-base percentage of .372, and slugged .572 – all career-highs. He hit a career-high 37 home runs and a second-best career number of 37 doubles.
Between 2001 and 2003, Boone had 107 RBIs or more each season. And Boone is still the Mariners all-time leader among second basemen in home runs (142), RBIs (531) and slugging percentage (.479). This is why he is the Mariners best second baseman in franchise history.