Manager Willie Randolph said several factors went into making the deal: Matsui wasn't producing; Jose Valentin was doing a good job at second base, and the Mets liked Marrero's versatility.
Matsui will make $8 million this year, which the Mets would have gladly paid if he were producing. Instead, they were happy to pay $4.5 million remaining on his contract to make the deal.
"He didn't play well at times, and injuries limited him," Randolph said. "The deal helps the club right now."
Randolph said he never lost confidence in Matsui, but was quick to rubberstamp the deal when general manager Omar Minaya broached the idea.
"I felt a lot of support from Willie," Matsui said. "The fact that I couldn't produce for him is one of the most disappointing things for me to look back on."
REPLAY: The Mets crushed a season-high five home runs to give the erratic Steve Trachsel the cushion he needed in Friday night's 10-6 victory over the Arizona Diamondbacks.
The Mets have been in a long-ball tear, hitting at least one in 16 of their last 21 games and 58 total over their last 41 games overall.
Carlos Beltran and Carlos Delgado homered twice, and David Wright once. Beltran has 17, one more than last year's mark, and Delgado has 387 for his career, good for 48th place on the all-time list.
LF Cliff Floyd is still day-to-day with a sprained left ankle. He had hoped to play in the weekend series at Arizona, but manager Willie Randolph doesn't anticipate him back in the lineup until Tuesday at Philadelphia at the earliest.
OF Xavier Nady, on the disabled list following an emergency appendectomy, will travel Saturday to the Mets' spring training facility in Port St. Lucie, Fla., to begin his rehab. There's no timetable when he would play in any minor-league rehab games.
2B Kaz Matsui was traded Friday to Colorado for Eli Marrero. Matsui said he waived a no-trade clause in his contract "to try and get a fresh start."
CF Carlos Beltran hit two homers Friday night to give him 17, one more than last season's total. Beltran said the difference between last year and this one is that he's playing more relaxed, and attributes that to being healthy.
1B Carlos Delgado hit two homers Friday to give him 387 for his career and move into sole possession of 48th place on the career list. Delgado needs two homers to tie Hall of Famer Johnny Bench.
BY THE NUMBERS: 58 -- Homers by the Mets in their last 41 games.
QUOTE TO NOTE: "He didn't play well at times, and injuries limited him." -- Mets manager Willie Randolph, after the trade of second baseman Kaz Matsui to Colorado.