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Story summary
- NASCAR delayed Cup practice at Mexico City after an engine issue stranded teams in Charlotte.
- Driver Ryan Truex (33) drove the No. 11 Toyota for Joe Gibbs Racing Sunday, replacing driver Denny Hamlin, who missed the race for his newborn son and received a NASCAR waiver to keep Playoffs eligibility.
- Performance center head Caitlin Quinn used hypoxic masks and a tent to ready drivers for the 7,500-foot altitude.
