The Marlins may have won the Series, but their brother expansion team has the National League's Most Valuable Player. After a season spent flirting with a .400 average, Colorado's Larry Walker was the runaway choice for a year in which he hit .366 with 49 home runs and 130 RBIs. Like Ken Griffey, Jr., who was named MVP in the American League yesterday — actually, like everyone who's ever won the award but didn't make it to the World Series — Walker says he'd trade the hardware for a championship ring. So far, no one has taken him up on the offer.