Ken Griffey, Jr. became the 2nd star player this year to succumb to a dislocated shoulder. This is a huge blow to the Reds, and to Griffey's chances of breaking Aaron's home run record.

When he left Seattle, Griffey seemed a shoe in to threaten 755 HR. But injuries have cost him a lot of playing time over the last few years. Just goes to show how difficult it is to predict who will break a record.

Update: Ben Jacobs reminds me that Phil Nevin also had a dislocated shoulder. I guess that would have been the trade that hurt both clubs. :-)