This amounts to a "multiple items per condition (=key field)" mailmerge
which Word does not really have the ability to do:

See the "Group Multiple items for a single condition" item on fellow MVP
Cindy Meister's website at
http://homepage.swissonline.ch/cindymeister/mergfaq1.htm#DBPic

Or take a look at the following Knowledge Base Article

http://support.microsoft.com/default.aspx?scid=kb;en-us;211303

or at:

http://cornell.veplan.net/article.aspx?&a=3815

however, you wanting to do this to email adds another complication and I
think that probably the only way to do it is by using VBA to create a
"roll-your-own" equivalent to mailmerge where you use a template in place of
the mailmerge main document and have your code create a new document from
that template for each player and populate that document with the events for
each player, then email it before proceding to the next player.