Serena Williams warmed up before taking the court for her match against Li Na, the first match of Day 2.
Li Na had won the pair's only previous meeting on indoor hardcourts, and stormed out to an early 4-1 lead.
Though she would lose that lead and eventually lose in straight sets, Li Na pushed Serena Williams hard.
And the fans at the Sinan Erdem Dome made their love for the match known - signs, cheering, noisemakers...
One fan even had two signs - remember that face, because this fan had the experience of a lifetime after.
Serena Williams and Li Na met at the net after Williams' 76(2) 63 victory over her fellow thirty-something.
After the match, Serena Williams headed over to one of her most enthusiastic cheering sections in the crowd.
Serena Williams wouldn't just give a high five to one of her biggest fans, a big ol' hug was on its way.
Serena Williams is a former No.1 and 15-time Grand Slam champion - and a four-time Olympic gold medalist.
Speaking of No.1s and champions, Victoria Azarenka showed her fighting spirit to pull through her match.
Angelique Kerber held double match point at 5-4 in the second set but Victoria Azarenka found a way to win.
Victoria Azarenka battled more than three hours to score a 67(11) 76(2) 64 win in three hours and six minutes.
Maria Sharapova had her hands even more full, needing three hours and 12 minutes to get past Aga Radwanska.
Maria Sharapova's 57 75 75 win sent her into the semifinals - Serena Williams would qualify Wednesday too.
Victoria Azarenka also received the Diamond ACES Award from the WTA after her match on Wednesday night.