Murphy, one of the few Mets to avoid injuries last season, had been anointed the starting first baseman, although Ike Davis, the Mets� top position prospect, is expected to push Murphy aside by 2011. But for now, Davis will head to Class AAA Buffalo while the veteran Mike Jacobs takes over at first. With the Mets also deciding on Wednesday to delay Jose Reyes�s regular-season debut, it means that their opening day lineup will include at least three backup players � Jacobs, Alex Cora and either Angel Pagan or Gary Matthews Jr. In discussing the Murphy situation with reporters, General Manager Omar Minaya did not wait to be asked about the 23-year-old Davis, who had a standout spring, before dismissing the possibility of his starting the season in Flushing. �Right now, our plan is to let Ike Davis develop in the minor leagues,� Minaya said. Jacobs had been a strong candidate to be a left-handed power hitter off the bench for the Mets. Now that he will probably be starting for a while, it opens up roster possibilities for Chris Carter, who on Wednesday hit his fourth home run of the spring, this one off Florida�s Josh Johnson, who will face the Mets again Monday in the season opener at Citi Field. Jacobs, who was signed to a minor league deal during the off-season, has hit only .194 in spring training, with two home runs. But he has experience, and power from the left side. Last year, he hit 19 home runs for Kansas City; in 2008 he hit 32 homers with 93 runs batted in for the Marlins