The longtime Phoenix Mercury star is joining the Atlanta Dream, and discussed her decision in an Unrivaled social media clip.

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 Shams Charania and Alex Phillipou were first to break the news.

After 11 seasons in Phoenix, 10-time WNBA All-Star Brittney Griner has agreed to a deal with the Atlanta Dream, sources tell me and @alexaphilippou. Griner spent her entire career with Mercury and now heads to Atlanta in one of most stunning free agency moves in league history. pic.twitter.com/NfdAuYOAVs

Brittney Griner is officially headed to the Atlanta Dream, ending her 11-season tenure with the Phoenix Mercury in one of the WNBA’s most significant free agency moves. The 10-time All-Star’s decision was announced Tuesday night.

WNBA All-Star Brittney Griner is on the move. Griner has agreed to a one-year deal with the Atlanta Dream in free agency.

Griner entered the offseason as the second-longest tenured WNBA player with one team, having spent her entire career in Phoenix.

Brittney Griner will leave a legendary legacy with the Mercury after playing 10 seasons with them, before signing with the Dream.

In a move that shakes up the WNBA, Brittney Griner is joining the Atlanta Dream in free agency after a decorated 11-season stint with the Phoenix Mercury.