La 15a tappa, la più lunga della Vuelta di quest'anno con i suoi 230,8km tra Mos e Puebla de Sanabria, è stata vinta in volata da Jasper Philipsen, al primo grande successo parziale in carriera, davanti a Pascal Ackermann e Jannik Steimle. In attesa delle prossime due giornate, probabilmente più decisive, gli uomini di testa hanno controllato i diretti avversari, la classifica generale è rimasta così invariata.
Sotto la pioggia per una parte del percorso, la tappa odierna si è animata quando, a poco più di 30km dall'arrivo, Mattia Cattaneo ha lasciato i compagni di fuga trovando uno scatto che sembrava portarlo solo al traguardo. Dopo un interessante tentativo fallito dell'elvetico Gino Mäder di raggiungere l'italiano, la velocità del gruppo nel tratto conclusivo ha permesso però agli inseguitori di rientrare, dando vita a una volata finale che ha favorito il belga.
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