WATCH: Lloyd Harris upset Nadal in three dramatic sets at the Citi Open on Thursday.

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Rafael Nadal still expects to play the National Bank Open next week in Toronto, saying his foot problems have improved despite a third-round exit this week at the Citi Open in Washington event.

The 35-year-old Spaniard fell to Lloyd Harris in three sets on Thursday, having played more than three hours the day before to defeat Jack Sock in his opening round.

"The most positive thing is my foot was better today than yesterday. I was able to move a bit better, so that is very important, especially for me personally, no, to keep enjoying the sport, no, and keep having energy," Nadal told press at Washington, D.C., where he was playing his first event since his Roland Garros semifinal defeat to Novak Djokovic.

I honestly didn't have two easy months. I had a lot of problems with my foot. I was not able to practice all the days that I really wanted, but I did as much as I could. And I tried hard here. Rafael Nadal

"I honestly didn't have two easy months. I had a lot of problems with my foot. I was not able to practice all the days that I really wanted, but I did as much as I could. And I tried hard here."

Nadal found satisfaction with his performance except for what he called a nervy final game against Harris.

"I think I played better than yesterday. But, yeah, I mean, all the credit to him that he played aggressive," said Nadal.

"Yeah, for me it's just to keep going. Accept the challenge that I need to keep working, and I have probably another chance next week in Toronto. I'm going to keep trying my best."

He is also scheduled for the following week's event at Cincinnati, though he could withdraw if he decides he has had enough competitive play or experiences more injury problems.

Nadal is No.3 in the rankings, though is tentatively set to switch places with No. 4 Stefanos Tsitsipas—a new career-high ranking for the Greek.