After the Yankees signed Johnny Damon over the winter, New York had five of the game's top 20 run scorers from 2005: Alex Rodriguez, Derek Jeter, Damon, Hideki Matsui and Gary Sheffield. The potent 2006 lineup also features four of the top 30 on-base percentages from a year ago, and the sixth-best 2005 mark on this year's team was Damon's, a respectable .366. Only the Red Sox outscored the Yankees in 2005, and Damon's defection suggested no one might outscore the Bronx Bombers this year. At this point, that's true: the Yankees have put up more runs than all major league clubs. But can they keep it up with Matsui (broken wrist) out until at least September and Sheffield (wrist-ligament tear) possibly sidelined for a month or two? The loss of run production will put more pressure on an aging and injury-plagued rotation. None of New York's starters had a stellar year in 2005, and only Mike Mussina has been on top of his game this spring. The bullpen has been better, but currently Mariano Rivera is battling back problems. The Yankees probably would have focused on getting a starter or two before the trade deadline. Now their needs may be numerous with a starting outfield that often features unproven prospect Melky Cabrera and less-than-productive veterans Bernie Williams and Terrence Long. The Yankees have a 4.52 team ERA that ranks ninth in the American League. Will that be good enough if they can't keep scoring at the pace they've set so far?