Star Brittney Griner has agreed to a one-year deal with the Atlanta Dream, sources told ESPN on Tuesday. Griner, who has spent her entire career in Phoenix after being drafted No. 1 overall in 2013, heads to Atlanta in one of the most stunning free agency signings in league history.

Brittney Griner is leaving the Valley for Atlanta. After 11 seasons entirely played with the Phoenix Mercury, the 10-time All-Star center Griner has agreed to join the Atlanta Dream in free agency. ESPN's Sham Charania and Alex Phillipou were first to break the news.

In one of the most newsworthy free agent moves in WNBA history, 10-time All-Star Brittney Griner has agreed to a deal with the Atlanta Dream, according to Alexa Philippou. Griner, the No. 1 overall pick in the 2013 draft, has spent her entire career to this point with the Phoenix Mercury .