Horacio Zeballos apologizes on Twitter to anyone whom he offended when he replied “Who?” to a question as to whether the absent Juan Martin del Potro had texted the team congratulations after Argentina beat Germany in Davis Cup last weekend. Zeballos said the team did receive a message from del Potro after the press conference has ended. Del Potro has decided not to play Davis Cup this year.

“I was simply absorbed in other thoughts and I did not hear the question and I said 'Who?'” I want to apologize to anyone who was offended by my [press conference], especially del Potro and he knows that I have great respect for him as a great player and many people know that I have always said that if Argentina wants to win Davis [Cup] he has to be on the team. He is a pillar of our sport. It was a mistake because I’m inexperienced in front of the cameras.”