It will be his only indoor race of the winter.
The famous barefoot middle-distance ace is now taking on much longer races.
He opened the race with a 59-second 400m.
The winner wasn't decided until the final 20 meters.
They will race the 3,000m final tonight.
The new event is in addition to the women's 5K and the kid's run.
At the age of 37, she finally won gold.
He's now going to give the half marathon a shot.
Both runners own American indoor records.