In terms of infield defensive versatility, Jose Lopez is right at the top of the list for the Seattle Mariners.

Julio Cruz was an original Seattle Mariner, who had been in the California Angels farm system for three years.  Cruz saw action immediately as a rookie n 1977, and as a sophomore, he was affixed as their starting Second Baseman.  While he was a light hitter (only 17 Home Runs, with a Mariners Slash Line of .243/.327/.307), Cruz was a quick player who knew what to do once he was on base.  He would steal 59 Bases in 1978, and would hit the 40 SB mark in the four years after. 

A World Series Champion as a rookie in 1978 with the New York Yankees, he would be traded two seasons later to the other side of the country and standings when he went to Seattle.

Phil Bradley played the first five years of his Major League career with the Seattle Mariners, and it was in the Pacific Northwest where he posted his best numbers.