So just how important is the closer on a baseball team? The closer may be the most important player on a good team. If you've beaten a team for all or most of eight innings, there is seemingly nothing more devastating than blowing the lead in the ninth. If you've come from behind late to get the lead, you need to seal the deal. But is the closer critical on a losing and/or rebuilding team? Here's my take on the O's and the closer position for the 2010 season.