Naomi Osaka says she was as confused as anyone when Serena Williams had her altercation with umpire Carlos Ramos in the final of the US Open.

The 20-year-old major winner couldn’t understand what was going on when Williams appeared to get into a fight with Ramos during the match.

“I’m not really sure what happened between Serena and the umpire,” Osaka said.

See Osaka’s full comments in the video below.