1917usnationalchampionshipstennis

en.wikipedia.org/wiki/House_of_Salm

Ludwig von Salm-Hoogstraeten (24 February 1885 – 23 July 1944), Austrian tennis player en.wikipedia.org/wiki/Ludwig_von_Salm-Hoogstraeten (PS: this was his brother) In American newspapers he appears as "Count Otto Salm-Hoogstraeten", s. e.g. The sun., July 01, 1917, Section 2, Page 3, col. 4 chroniclingamerica.loc.gov/lccn/sn83030431/1917-07-01/ed-..., but it's apparently the same man.

see also

and thepeerage.com/p9788.htm#i97878
which lists his birth and death differently than Wikipedia:
" b. 25 August 1886, d. 1941"

The NYT, April 21, 1916 reported that Otto Salm-Hoogstraeten had an elder brother Ludwig, who was military aid to the governor of Vienna. query.nytimes.com/mem/archive-free/pdf?res=980DE3DD113FE2... This conforms to the wikipedia entry of Ludwig, so the man on the photo is indeed Otto, not Ludwig.

A November, 1920 account of the tennis-playing Salm brothers from American Lawn Tennis magazine: "Count Otto Salm Goes Home Count Otto Salm well known in tournament play in the East during the half dozen years returned to his home in Vienna several months ago accompanied by Countess Salm who was an American girl. It is understood that he expects to remain in Vienna for some time perhaps permanently. Salm was one of three brothers prominent in lawn tennis. The eldest and the best player is Ludwig who remained in Europe during the war and was engaged in it on the Austrian side of course. The youngest brother Alexander came to New York with Otto about 1912 accompanied by Georges Aranyi a Hungarian who had been engaged in business in Paris. The three took part in a number of tournaments in this country, Otto being the most consistent participant in match play as well as the most successful. He won the Maine championship if memory serves before this country became involved in the war and he had some other good performances to his credit. His play was at times brilliant but nearly always erratic. Both Otto Salm and Aranyi became involved in the ban placed on enemy players by the USLTA and they did not compete in tournaments here after 1916." books.google.com/books?id=6GQ-AQAAMAAJ&pg=PA534&l...

Paul Alexander Wolf (1868-1954) A 1920 biographical sketch: "Paul Alexander Wolf commander of the Sixty sixth Infantry Brigade is a native of the state whose soldiers he led in France He was born in Kewanee Illinois December 23 1868 and was appointed to West Point from Princeton Illinois in 1886 Following his graduation General Wolf then a second lieutenant served with the Third Infantry in the winter of 1890 91 in the last important Indian campaign that against the Sioux in South Dakota He served in Cuba in the Spanish American War and in the Philippines from 1899 to 1902 being on the staff of General Frederick Funston during a part of the time He served in the Philippines again from 1903 to 1905 taking active part in the third Moro campaign on the staff of Major General Leonard Wood In 1913 and 1914 he was on the Mexican border and in April of the latter year he went to Vera Cruz Mexico where he served as chief of public works during the seven months of American occupation General Wolf was made a lieutenant colonel in 1916 and a colonel in the National Army in August 191 7 He commanded the two officers training camps at Plattsburg New York from May 1 to December 22 191 7 and commissioned 8,000 officers from these camps He was promoted to the rank of brigadier general in February 1918 and assigned to command the Sixty sixth Infantry Brigade of the Thirty third Division General Wolf led this brigade through the fighting in France and until its return to the United States in May 1919 He remained in France to serve as captain of the AEF rifle team which won first place in the inter allied competition at Le Mans in July 1919 General Wolf's services were recognized by the United States government by the award of the Distinguished Service Medal He received also the decorations of Officer of the Legion of Honor and the Croix de Guerre with Palm from the French and Companion of the Bath from the British " books.google.com/books?id=geALAAAAYAAJ&pg=PA173&l... www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=131763307

In August 1917 he served as a linesman in a tennis match between Mary Browne and Molla Bjurstedt at Forest Hills (M. Bjurstedt won the match). Evening star., August 21, 1917, Image 13, col. 3 chroniclingamerica.loc.gov/lccn/sn83045462/1917-08-21/ed-... Mary Browne: www.flickr.com/photos/library_of_congress/21517632679/

The bare frame for an awning at the left above him matches the photo of the Forest Hills building.
So this was probably taken there.

agree, and:

Seiichiro Kashio (柏尾誠一郎 Kashio Seiichiro?, January 2, 1892 – September 6, 1962) was a male tennis player from Japan, and with Ichiya Kumagae was one of the first Japanese Olympic medalists. en.wikipedia.org/wiki/Seiichiro_Kashio

He went out in the second round in 1917: query.nytimes.com/mem/archive-free/pdf?res=9B00E6DC103AE4... The Wikipedia entry could be more complete re U.S. Open: www.tennisabstract.com/cgi-bin/player.cgi?p=SeiichiroKash...

Thanks, guys, we'll update the record.