Federer was the second match on
Two-time defending women's champion
After her 7-6 (2), 6-2 win over No. 91-ranked
Asked how he handled the heat, the 32-year-old Federer said: "I'm here. I'm speaking. Actually, it's not crazy. I'm feeling OK right now."
He now owns the record for playing the most consecutive Grand Slam events, another milestone in a career that has already netted 17 major titles for the Swiss star.
Federer kept the points as short as possible, and gave No. 133-ranked Duckworth only one look at a break point in the 1-hour, 46-minute match.
Conscious of the time and the temperature, former No. 1-ranked
Wozniacki said the court was so hot in her 6-0, 6-2 win over Lourdes Dominguez Lino, which started at 11 a.m., that it seemed to melt her plastic water bottle.
Halep had a 6-0, 6-1 win over Polish qualifier Katarzyna Piter, while American
As well as the heat, there were injuries and retirements. No. 13
Isner attributed it to the same right ankle problem that bothered him on the way to the title at Auckland, New Zealand last week.