The Boston Celtics and Washington Wizards have emerged as frontrunners to sign Al Horford.

Horford is expected to make a final decision Saturday evening.

The Atlanta Hawks agreed to terms with Dwight Howard on the first day of free agency, but they haven't ruled out re-signing Horford. The Hawks also re-signed Kent Bazemore.

Horford met with four teams Friday in Atlanta, including the Celtics and Wizards.

Horford pared down his options on Saturday morning.