the following is a list of 2004 seattle mariners draft picks. the mariners took part in the june regular draft, also known as the rule 4 draft. the mariners made 48 selections in the 2004 draft, the first being shortstop matt tuiasosopo in the third round. in all, the mariners selected 18 pitchers, 13 outfielders, 6 catchers, 6 shortstops, 3 first basemen, 1 third baseman, and 1 second baseman.