[1] Starting in 2011, the Breeders' Cup also pays the entry fee and provides a travel allowance for the connections of the challenge race winners.
[2] NBC Sports has a longstanding agreement to both broadcast and live stream many of the "Win and You're In" challenge races, from June to October.
The Fleur de Lis, Suburban, John Nerud, Personal Ensign, Iroquois, Pocohantas, Jockey Club Derby, Santa Anita Sprint Championship, Zenyatta and First Lady were removed from the series.
Fourteen of the series winners later raced in the Breeders' Cup, with four of them winning: War Pass in the Juvenile, Ginger Punch in the Distaff, English Channel in the Turf and Curlin in the Classic.
Thirteen races were added to the series: the (South African) Queen's Plate, Gran Premio 25 de Mayo, Stephen Foster Handicap, Personal Ensign, Grosser Preis von Baden, Gallant Bloom, Pilgrim, Miss Grillo, Bourbon, Royal Lodge, Middle Park, Beresford, and the Prix de la Foret.
[11] Thirty-seven horses entered in the 2014 Breeders' Cup races qualified via the challenge series, including four of the winners.
[13] Thirty-seven entrants in the 2015 Breeders' Cup qualified via the Challenge series with six winning their respective divisions, including American Pharoah.
[17] Two Challenge series winners went on to win their respective division at the Breeders' Cup: Highland Reel and Classic Empire.
The following races were removed from the series: Doncaster Mile, Legacy Stakes, Gran Premio 25 de Mayo, Highlander, Forego, Spinaway, and Joe Hirsch Turf Classic.