Count Ludwig von Salm-Hoogstraeten (German pronunciation: [ˈluːtvɪç fɔn ˈzalm ˈhoːkˌʃtʁaːtn̩]; Hungarian: Salm Lajos [sɒlm ˈlɒjoʃ]; 24 February 1885 – 23 July 1944), nicknamed "Ludi", was an Austrian tennis player of the pre-Open Era.

[8] In April 1911 he won the San Remo doubles together with Anthony Wilding after defeating the German duo of Curt Bergmann and Friedrich Rahe.

[12] In 1913, he was a doubles semifinalist in the Monaco tournament with French netman Max Decugis but ceded the victory to Kleinschroth and Rahe in a straight two-set match.

[23] In 1925, his playing license was suspended by the Austrian Lawn Tennis Federation for failing to show up at an international match in Breslau (this ban was lifted a couple of years later[24]).

[25] In 1926, he reached the quarterfinals of the French International Hard Court Championship partnering Béla von Kehrling; they were defeated by eventual victors Howard Kinsey and Vincent Richards.

It was the second time within a year that Salm's misbehavior stirred international controversy, and as a result, an official ban was requested to deny him access to tournaments.

[28] On another occasion in 1928, while he was participating in the mixed doubles at Cannes, he drew attention when he walked off the court in outrage during a match after a ball flew in from outside, distracting him so that he lost the point.

[29] In 1928 at New Courts Club tournament in Cannes, Salm partnered with Austrian champion Hermann von Artens and won the doubles without losing a set.

[33][34][35] In 1931, he earned a second place at the veterans' singles of the French Championships granting a flawless two straight sets victory to Briton Leighton Crawford.

[1][2] During World War I, Count von Salm-Hoogstraeten served as a dragoon officer in the Austrian Army and as a military aide to the governor of Vienna.

[38] According to his friend Sidney Wood, the root cause behind his suicide was that the Nazi regime pressured him to engage in espionage, which he refused to do and thus the SS wanted to hunt him down.