Brittney Griner is picking up right where she left off with the Phoenix Mercury ... smiling from ear-to-ear as she donned the team's uniform once again for a photoshoot.
The Mercury posted a behind-the-scenes look at Griner posing for the cam on Friday ... just days after the WNBA star signed a one-year deal to solidify her return to Phoenix.
In the video shared on the Mercury's official Twitter account, BG was her normal charismatic self ... showing off her dribbling skills and grinning as the cameras fired away.