Tagliani was penalized for an incident at Turn 10 involving another car.
Petit Le Mans will decide the champions.
At Watkins Glen, no. 63 Scuderia Corsa Ferrari 458 Italia rebounds from two laps down to finish fifth.
'The conditions were exhausting'
The Spirit of Daytona team took the overall victory in the Sahlen Six Hours of the Glen Sunday.
Ryan Dalziel in the Extreme Speed Prototype fastest in practice
It's the third of four races deciding the Patron Endurance Cup
What can the winners of the last round of the TUDOR United SportsCar Championship accomplish this weekend at Watkins Glen?
Brandon Davis joins Alessandro Balzan and Jeff Westphal for Sahlen's Six Hours of the Glen.
Through two events – and 36 hours of competition – the Patrón Endurance Cup has lived up to its billing as a true “endurance” championship.