Q. Just tell us what happened.
JUAN MARTIN DEL POTRO: You have to ask Roger what happened. I can’t do nothing in the match. He play like No. 1 of the world, so that’s it.
Q. Were you nervous at all when you entered the court?
JUAN MARTIN DEL POTRO: No, I just have a bad day. He’s Roger Federer. If you don’t be good, you lose.
Q. What did you think happened after the first set?
JUAN MARTIN DEL POTRO: I don’t know. I don’t have a good day. I play bad, but he do very good everything.
So I lost. Just I lost the match of tennis, and that’s it.
Q. Do you feel like basically there’s nothing you can do out there today?
JUAN MARTIN DEL POTRO: No. I cannot do nothing. He play, I don’t know ‑‑ I talk to him. He play like No. 1 of the world. He has a good night. I have to improve to play against them.
012709 tuesday /info-photo via Australian Open / Getty Images