Lleyton Hewitt says he and Roger Federer hit for four hours together last Monday.

“Roger and I have hit quite a bit the last couple of years,” said Hewitt, who has reached the fourth round of the U.S. Open. “I’ve had some really good practice sessions. Once he was coming here, I just got in touch with [coach Paul] Annacone seeing if he wants to hit some balls. I was surprised that Roger was here Monday morning and wanted to hit at 10:00. We hit for two hours, then another two hours in the afternoon. At least I got used to center court, which was a bonus. It was funny, we didn’t do any points at all. We just did drills for four hours.”