Irish-bred De Sica tagged favored Ramonti in the final strides to win Sunday's Derby Italiano (Ity-I) by a head at Capannelle.
Prince Kirk brushed the rail after passing favored Six Perfections with less than a furlong to go in Sunday's Prix d'Ispahan (Fr-I) at Longchamp, but recovered in time to hold on for an upset victory by a half-length.
Sunstrach, with Frankie Dettori riding, cruised to an emphatic six-length victory in the Italian Group I Premio Roma at Rome's Capannele on Sunday.
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