The 9 greatest players in Seattle Mariners history
When the Seattle Mariners signed Adrián Beltré to a five-year/$64 million deal ahead of the 2005 season, they thought that they were landing a superstar third baseman.
As it turns out, they were landing one of the best players in the history of the hot corner, but that's a legacy that Beltré would build largely with the division-rival Texas Rangers later in his career.
In 2004, Beltré's final season with the Los Angeles Dodgers, he finished runner-up to Barry Bonds in National League MVP voting, homering 48 times and posting a staggering 9.7 fWAR. Considering they signed him before his age-26 season, the Mariners had seemingly put themselves in position to employ Beltré during his peak seasons.

But for as sound as that logic was, Beltré was good, not great during the half decade that he spent playing his home games at what was then called Safeco Field. Across five seasons with the Mariners, Beltré slashed .266/.317/.442 with 103 home runs and a .759 OPS. While Beltré won two Gold Glove Awards as a Mariner, he didn't make a single All-Star team in five seasons with the team.
Beltré turned out to be the rare position player that was significantly better in his early-30s than his late-20s. After reviving his career with the Boston Red Sox in 2010, Beltré signed a five-year/$80 million deal with the American League West team he'd become most associated with, the Rangers.
Following a relatively disappointing tenure in Seattle, Beltré turned in Hall of Fame-caliber production the next five seasons, slashing .316/.364/.535 with 145 home runs and an .899 OPS. Beltré spent the final eight seasons of his career in Arlington, and has since had his No. 29 retired by the Rangers. When he's elected as a first-ballot Hall of Famer in 2024, Beltré's Hall of Fame plaque will almost certainly have him wearing a Rangers cap. In some senses, you're left to ponder why he couldn't sniff the same level of success during his five seasons with the Mariners.
Nonetheless, the Mariners organization has produced some of the best players of the last 30 years, many of whom cracked our list of the nine greatest players in Mariners history: