Formula 1 icon Mario Andretti believes Carlos Sainz is ‘world championship material’ amid Red Bull chief Christian Horner targeting the axed Ferrari driver for a 2025 seat. The 29-year-old is currently without a drive for next year after the Scuderia elected against a new contract. Ferrari decided to sign Lewis Hamilton from Mercedes over giving Sainz a deal to remain in Maranello. His existing terms were already due to expire after the 2024 season. Sainz has raced in red since leaving McLaren to replace Sebastian Vettel as Charles Leclerc’s teammate in 2021. The Spaniard has since secured all…