Roger Penske and Sam Hornish Jr. have been together for nearly 300 races over the last decade.
They have celebrated an IndyCar championship as well as wins in two series across nine states. They have been dominate and disappointed. They have turned a working relationship into a lifelong friendship.
So parting ways won't be easy.
Hornish drove his final race for Penske on Saturday, a 12th-place finish in the Nationwide Series season finale at Homestead-Miami Speedway. Hornish came up three spots shy of going out with a championship.
He ended up second to Austin Dillon in the final standings. Sprint Cup regular Kyle Busch won the race. Hornish was near the front for much of the 200 laps, but faltered down the stretch on worn tires.
Now, he faces an uncertain future.