Things got ugly for Anna Kournikova at an afterparty in Vegas on Saturday night.

The former tennis champ attended the HardBat Classic Ping-Pong tournament earlier, where she refused to play. “She wouldn’t play Ping-Pong because she was really scared that she was going to be bad,” a source tells E! News.

After a minor run-in, as insider tells People magazine: “The woman came back over and threw a drink on Anna and her assistant. The woman was definitely drunk.”

“Anna said she wanted the woman kicked out, but then everything started to escalate and she and the woman started shoving and pushing each other,” the source tells, adding, “Anna looked really shaken up.”