[4] In May 1904, four-year-old Irish Lad won the prestigious Metropolitan Handicap at Morris Park Racecourse[5] then on June 26 at the Sheepshead Bay Race Track he set a world record of 2:17.60 for a mile and three eighths on dirt in winning the Advance Stakes over what the New York Times described as five of the best horses in the United States.

[6] Irish Lad came out of the July 9 Brighton Handicap badly lame and was retired [7] but in May 1905 it was announced that he was back in training.

[8] In June 1905 Irish Lad finished ninth in an all-age handicap at Gravesend Race Track [9] and shortly thereafter was retired to stud.

[10] Irish Lad had sired only a few horses while at stud in the United States when the Legislature of New York passed the Hart–Agnew anti-betting law that resulted in the complete shutdown of racing.

As a consequence, Irish Lad, along with other horses owned by Duryea such as Frizette, were sent to his newly acquired Haras du Gazon stud farm in Neuvy-au-Houlme in Lower Normandy, France.