In a home opener unlike any other at Wrigley Field, the Chicago Cubs will raise a banner as defending World Series champions for the first time since they moved into the venerable ballpark more than a century ago. ''Oh, it'll be crazy,'' young slugger Kyle Schwarber said. Once the festivities are finished, the Cubs will send Jon Lester to the mound against the Los Angeles Dodgers, who lost to Chicago in the NL Championship Series last year.