International racing fans' attention now turns to the May 1 Champions Mile and the Chairman's Sprint Prize in Hong Kong, as 2015 Breeders' Cup Turf Sprint winner Mongolian Saturday takes on Australian multiple graded stakes-winning stars Buffering and Chautauqua in a leg of the Global Sprint Challenge that offers a $1 million bonus for wins in three of 10 eligible G1 sprint events in five countries.