The player credited for hitting a homerun for the Portland Beavers was apparently Arthur Theodore Kruger, who was starting his eleventh year of playing minor-league baseball.

Thanks to Craig Adams for supplying a copy of this advertisement. A scan of this advertisement is located at the University of Oregon's Historic Oregon Newspaper site:
http://oregonnews.uoregon.edu/lccn/sn83025138/1913-04-14/ed-1/seq-12/.
 
Morning Oregonian, April 14, 1913, page 12:
Oregon Telephone Herald advertisement