Biggest races where rider never competed
Major races where Sienna Mackey never competed in.
| # | Race | Class |
|---|---|---|
| 1 | World Championships WE - Road Race | WC |
| 2 | La Flèche Wallonne Féminine | 1.WWT |
| 3 | Giro d'Italia Women | 2.WWT |
| 4 | Ronde van Vlaanderen - Tour des Flandres WE | 1.WWT |
| 5 | Trofeo Alfredo Binda - Comune di Cittiglio | 1.WWT |
| 6 | Classic Lorient Agglomeration | 1.WWT |
| 7 | Simac Ladies Tour | 2.WWT |
| 8 | World Championships WE - ITT | WC |
| 9 | Premondiale Giro Toscana Int. Femminile - Memorial Michela Fanini | 2.2 |
| 10 | Omloop Nieuwsblad WE | 1.WWT |
| 11 | Internationale LOTTO Thüringen Ladies Tour | 2.Pro |
| 12 | Durango Durango Emakumeen Saria | 1.1 |
| 13 | Gent-Wevelgem In Flanders Fields WE | 1.WWT |
| 14 | Strade Bianche Donne | 1.WWT |
| 15 | Amstel Gold Race Ladies Edition | 1.WWT |
| 16 | Tour of Britain Women | 2.WWT |
| 17 | Fenix Omloop van het Hageland | 1.1 |
| 18 | Milano-Sanremo Donne | 1.WWT |
| 19 | Gracia | 2.2 |
| 20 | Liège-Bastogne-Liège Femmes | 1.WWT |
| 21 | Tour Cycliste Féminin International de l'Ardèche | 2.1 |
| 22 | EPZ Omloop van Borsele Women | 1.1 |
| 23 | Philadelphia Cycling Class p/b AmeriGas | 1.1 |
| 24 | Le Samyn des Dames | 1.1 |
| 25 | European Continental Championships WE - Road Race | CC |