Santana is 93-44 with a 3.22 ERA in eight major league seasons, winning the AL Cy Young Award in 2004 and 2006. He has been less successful in the playoffs, going 1-3 with a 3.97 ERA.

Santana had a subpar season in 2007, going 15-13. He lost seven of his last 11 decisions as his ERA rose from 2.60 to 3.33 ERA, his highest since 2001, and he allowed a career-high 33 homers — the most in the AL.

For the Mets, the hope is that he will be the next in a long line of aces behind Tom Seaver, Dwight Gooden, Glavine and Martinez.

“For our younger pitchers to develop under a guy like Pedro, a guy like Johan, you can’t ask for any better situation,” Wright said. “He’s going to go out there and he’s going to give you seven or eight innings every five days and he’s going to get you a win. That’s just what it comes down to. I’ve gotten a chance to get to know him a little bit the past couple years. He seems like a great clubhouse guy. He’s going to fit in perfectly with the chemistry that we have.”

With Santana gone, there is a big opening in the Twins’ rotation. Francisco Liriano is on track to return after missing last season following elbow surgery, but Carlos Silva signed with Seattle as a free agent, leaving youngsters Scott Baker, Boof Bonser and Kevin Slowey as the starters with the most experience.

“Joe Mauer’s job, and my job, just got a lot tougher,” backup catcher Mike Redmond said. “We’re going to have to work a lot harder to help these guys out the best we can.”

Humber, a 25-year-old right-hander, has made one start and four relief appearances for the Mets during the past two years, and went 11-9 with a 4.27 ERA last season for Triple-A New Orleans. The 22-year-old Gomez batted .232 in 125 at-bats with New York last year and .275 with 19 steals in the minors.

Guerra, who turns 19 in April, was 2-6 with a 4.01 ERA at Class A St. Lucie, and Mulvey, who will be 23 in May, was 12-10 with a 3.20 ERA in 26 starts at Double-A Binghamton and one at New Orleans.

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