This one is not so bad because of what the Mets lost, but because of what they received in return. Addition by subtraction only works when what is gained isn’t, itself, a subtraction.
Joining the Mets in 2004, Kazuo “Kaz” Matsui was nothing less than a disappointment in his two-plus years in New York. He was a star in Japan, batting as high as .322 and stealing as many as 62 bases in a season, but that success didn’t translate to the major league stage.
The middle infielder spent time at second base and shortstop and found little success at either position, struggling offensively and defensively. In his first campaign, he hit .272 with 32 doubles and 14 stolen bases in 114 games — which earned him some support in Rookie of the Year voting. In the field, however, he finished second in the league in errors committed.
Any promise his 2004 season held was dashed in 2005, as his batting average fell to .255 and his on-base percentage slumped to a meager .300 in just 87 games. By 2006, he was slashing .200/.235/.269 and the Mets decided the Matsui experiment had to come to an end.
Having all but lost his starting job to Jose Valentin, Matsui was shipped off to the Rockies for Cuban catcher/outfielder Eli Marrero on June 9.
Matsui went on to hit .345 for Colorado that year, then hammered out two decent campaigns in 2007 and 2008, averaging 26 stolen bases and 25 doubles per season, while hitting .290.
Marrero — who was batting just .217 at the time of the trade and was a .245 career hitter prior to 2006 — lasted 25 games with New York. He hit .182 in 33 at-bats and was released on August 9, ending his Mets, and major league, career.
Escaping the Big Apple helped Matsui turn a corner in his career. Adding Marrero helped nothing. Though Matsui was struggling, trading him, it seems, was a worse deal than doing nothing at all.