May 1903
2nd - 29th Kentucky Derby: Hal Booker aboard Judge Himes wins in 2:09
3rd - AVC Heracles (SC Heracles '74) soccer team forms in Almelo
6th - Chicago White Sox commit 12 errors against Detroit Tigers
14th - President Theodore Roosevelt visits SF
16th - George Wyman makes 1st motorcycle trip across the US
17th - Cleve Indians beat NY Highlanders 9-2 in Columbus Ohio
22nd - Launch of the White Star Liner, SS Ionic.
23rd - 1st automobile trip across US from SF to NY, ended April 1
23rd - 1st direct primary election law in US adopted, by Wisconsin
26th - Start of Sherlock Holmes "Adventure of 3 Gables" (BG)
27th - 37th Belmont: John Bullman aboard Africander wins in 2:21.75
27th - Queen Wilhelmina opens Berlages Merchants bureau in Amsterdam
29th - May coup d'etat: Alexander Obrenovich, King of Serbia, and Queen Draga, are assassinated in Belgrade by the Black Hand (Crna Ruka) organization.
30th - 28th Preakness: W Gannon aboard Flocarline wins in 1:44.8
source: HistoryOrb.com