Chesterfield 3-1 Aston Villa: Paul Lambert's men slip to defeat
Aston Villa suffered their first defeat of their pre-season campaign, losing away to Chesterfield.
Tendayi Darikwa and Sam Hird fired the League One hosts into a 2-0 lead before a young Villa side pulled one back through substitute Jack Grealish early in the second half.
Sam Morsy added a late third for Chesterfield, who were champions of League Two last season.
Villa had beaten Mansfield 3-1, FC Dallas 2-0 and Houston Dynamo 1-0.
Aston Villa: Guzan, Lowton (Bacuna), Herd (Okore), Donacien, Bennett (Stevens), Gardner (El Ahmadi), Johnson, Carruthers, Burke (N'Zogbia), Tonev (Grealish), Robinson.
Chesterfield: Lee, Jones (Maguire), Evatt, (Onovwigun), Hird (Gardner), Darikwa, Morsy (Clark), Ryan (Dawes), Humphreys (Cooper), Roberts (Raglan), Boco (O'Shea), Gnanduillet (Doyle).