Lone Star Le Mans
The Lone Star Le Mans (previously known as 6 Hours of the Circuit of the Americas) is an endurance race for Le Mans Prototypes and grand tourer-style cars held at the Circuit of the Americas in Austin, Texas. Its first running was on 22 September 2013 as the fifth round of the 2013 FIA World Endurance Championship season.
On 2 December 2019, the Austin round was revived, as a result of a conflict between the promoters at the Autodromo Jose Carlos Pace and the WEC, where the Austin round replaced the 6 Hours of São Paulo. 
6 Hours of the Americas
The 6 Hours of the Americas was an event organised by the Stéphane Ratel Organisation (SRO) and would have been part of the inaugural season of the Intercontinental GT Challenge on March 6. On January 29 it was announced that the race would be cancelled with the official reason stated as a lack of entrants.
- Circuit of the Americas (2013-02-02). "CIRCUIT OF THE AMERICAS™ CONFIRMS WEC EVENT FOR 2013 LINE-UP". Endurance-Info.com.
- "FIA WEC Unveils 2013 Provisional Calendar". FIA World Endurance Championship. 28 September 2012. Archived from the original on 2013-10-29. Retrieved 2012-10-01.
- "São Paulo to be replaced by Austin, Texas". FIA World Endurance Championship. 2 December 2019. Retrieved 2019-12-03.
- "Intercontinental GT round at COTA to be cancelled". Motorsport.com. 29 January 2016. Retrieved 29 January 2016.