Rafael Nadal insists his injured wrist is improving as he prepares for his U.S. Open first-round match.
Novak Djokovic, the world's top-ranked player, also has a sore wrist just days out from his first-round match.
Nadal returned to competition and won a doubles gold medal at 2016 Rio Olympics. He also reached the semifinals in singles.
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"Well, I am better. I am a little bit better. It's obvious that when you have been out for two and a half months you need a little bit of time," Nadal, 30, said Friday. "I tried to go quickly, especially in the Olympics and then competing last week in Cincinnati, but the wrist still bothers me a little bit.
"It's true that the wrist bothers me a little bit less every day."
Djokovic and Andy Murray have seemingly put a gap between themselves and fellow "Big Four" members Nadal and Roger Federer entering the Grand Slam, which begins Monday. Federer is injured and will not play.
Djokovic withdrew from a recent preparatory tournament because of his injury, which remains a worry for the defending champion.
"The wrist hasn't been in an ideal state for the last three and a half weeks," he said on Friday. "But I'm doing everything in my power with the medical team to make sure that I'm as close to 100 percent as possible."
Spain's Nadal has 14 Grand Slam titles, most of them in the French Open. Djokovic has 12.
Djokovic won a title in Toronto after his early Wimbledon exit but took a stunning first-round loss in Rio.
Djokovic said private matters impacted him at Wimbledon, where he lost in the third round to American player Sam Querrey.
"Again, I am in a position, like everybody else, like all of you, we all have private issues and things that are more challenges than issues, more things that we have to encounter and overcome in order to evolve as a human being," he said of the issue, without going into detail.
"That was the period for me. It happened right there, was resolved and life is going on like everything else."