[3] A tall blonde-haired man, Loos was a good putter—seldom three-putting a green—and was sometimes called "Two-Putt Eddie" by the press and fellow players during his playing career.

[3][6] While posted as professional at Pasadena Country Club in March 1921, he won the California State Open beating John Black and Macdonald Smith by 3 and 4 shots, respectively.

In September 1917 Loos continued his good play by winning a 36-hole tournament held at Westmoreland Country Club near Chicago.

[10] He won the same event again in 1924 at Glen Flora Country Club in Waukegan, Illinois, battling rain and high winds in the process.

[11] On July 20, 1919, Loos partnered with Jim Barnes in a match play event contested at the Donald Ross-designed Beverly Country Club course in Chicago against Jock Hutchison and Bob MacDonald.

As he was preparing to tap in, he looked down and to his chagrin noticed the name "Walter Hagen" stenciled on the ball.

He had improperly played Hagen's ball instead of his own and was assessed a two-stroke penalty that gave the title to Ed Dudley.