Nick Kyrgios made tennis history as he won the men's singles and doubles titles at the same tournament

• Nick Kyrgios made tennis history on Monday.
• He became the first player to win the Citi Open men's singles and doubles titles in the same year.

Nick Kyrgios made tennis history on Monday as he became the first person to win the Citi Open men's singles and doubles titles in the same year.

The Australian beat Japan's Yoshihito Nishioka 6-4, 6-3 in the men's singles final on Sunday to claim his first ATP Tour title since 2019.

On Monday, he then teamed up with American Jack Sock to beat fourth-seeded duo Ivan Dodig and Austin Krajicek 7-5, 6-4 in the men's doubles final.

In the men's singles tournament, Kyrgios didn't drop a serve in any match.

"To see where I was at last year to now, it's just an incredible transformation," said the 27-year-old, who was runner-up at Wimbledon last month, after the singles final.

He added that he had been in some "really dark places" and was grateful to those around him for helping him through.

In May, Kyrgios revealed in an interview that there was a period in his life where he was engaging in self-harm, and abusing drugs and alcohol.

"There are so many people who have helped me get there," he said Sunday.

"But myself, I've shown some serious strength to just continue and persevere and get through all those times and be able to still perform and win tournaments like this one."

Following his win in the doubles, Kyrgios took to social media to thank his fans for their support during the tournament.

"Thank you so much to the city of Washington, the Washington fans, you guys are amazing and I can't wait to see you guys next year," he said.

Kyrgios next plays Argentine Sebastian Baez in the opening round of the Canadian Open on Tuesday.