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

The WNBA landscape was shaken up Tuesday. First, the Phoenix Mercury traded for Connecticut Sun star Alyssa Thomas. Then, longtime Mercury star center Brittney Griner decided to leave Phoenix after 11 seasons to join the Atlanta Dream.

Griner is signing a free-agent contract with the Atlanta Dream when free agency opens Sunday, ESPN's Shams Charania and Alexa Phillipou first reported. The 34-year-old, who was the No. 1 overall pick by the Mercury in 2013, spent her entire 11-season career in Phoenix before testing free agency this year.

Brittney Griner's time with the Phoenix Mercury has come to an end. After 11 seasons in Phoenix, Griner is departing in free agency. Per ESPN's Shams

Brittney Griner has agreed to a one-year deal with the Atlanta Dream, ending her tenure with the Phoenix Mercury after 11 seasons, ESPN reported.

Amid news of her move, Griner took to Instagram to make her first post about her free agency decision. She shared a clip of herself riding a boat alongside her new teammates, Jordin Canada, Rhyne Howard and Allisha Gray.

Brittney Griner has agreed to sign a contract with the Atlanta Dream after spending the entirety of her 11-year WNBA career with the Phoenix Mercury, sources told ESPN's Shams Charania and Alexa Philippou.

Brittney Griner’s time in Phoenix is over. The 10-time WNBA All-Star struck a one-year deal to join the Atlanta Dream in free agency Tuesday night, according to ESPN’s Shams Charania and Alexa Philippou. Specifics of the deal are not yet known. It will be made official after Saturday, when contracts across the league are allowed to be signed.

This is part of why trade packages for players like De'Aaron Fox are typically built around draft picks. The idea is that the team landing the star improves now, and then the team giving that player away reaps the benefits later.

The Phoenix Mercury add a perennial MVP candidate in Alyssa Thomas, but lose one of the faces of the franchise to the Atlanta Dream

Atlanta Hawks' forward Jalen Johnson will undergo surgery and miss the remainder of the season with a shoulder injury.