You could do this a couple of different ways... either create custom fields for each player (e.g. player1_email, player2_email and so on), or you can make it a multi-stage form.
Assuming you want each person entered as an indvidual lead, I'd go with the latter. So you could set up four landing pages that redirect to one another upon form submission. Alter the text on each to refer to the form being for the next player in that group and go from there. The trick will be linking the four submissions, but you can do that by using a hidden field with some kind of a variable, or by creating a custom field for "Group Name" or something like that.