Hi Loops, Sorry if I didn't explain clearly, what I want is the comparison of the second column before comma (,). I have tried the latest code.

use autodie;
my (%used, %player);
open $player{$_}, '<', "$_.txt" for qw( DR DL DC SW );
open my $formation, '<', 'formation.txt';
for my $position (<$formation>) {
        chomp $position;
        while (readline $player{$position}) {
                my ($name) = split;
                next if $used{$name};
                $used{$name} = 1;
                last;
        }
        print $position, ' ',  $_ // "NoPlayer\n";
}
[download]

but the output is

SW Varane,114.75
DR Arbeloa,149
DC Ramos,169
DC Pepe,163
DL Marcelo,148.5
SW Pepe,65.2
DR Carvajal,146
DC Varane,153
DC Nacho,134
DL Coentrao,148
[download]

Pepe is still repeating(although the value (163 and 65.2) is different). It supposed to be:

SW Varane,114.75
DR Arbeloa,149
DC Ramos,169
DC Pepe,163
DL Marcelo,148.5
SW Nacho,60.3
DR Carvajal,146
DC NoPlayer
DC NoPlayer
DL Coentrao,148
[download]