Mandy Moore cheers on ex Andy Roddick and his wife Brooklyn Decker with US Open anniversary

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Mandy Moore is all love for her ex, tennis legend Andy Roddick, 20 years after they dated.

"Andy was a really formative part of my young adult life and although we're not in touch, I was so moved by this article reflecting on the 20th anniversary of his US Open win and the kind of life he's (led) since," Moore posted on her Instagram Story on Monday, which was also the first day of the 2023 US Open.

"I'm so happy for him and his family," she added. "Congrats on this milestone, Andy!"

Her message referred to Roddick's recent GQ feature story, and Moore's Instagram shoutout included a re-share of his wife Brooklyn Decker's post about the article.

Decker, who has been married to Roddick since 2009, responded to Moore's well-wishes in the comments under her post, calling the "This Is Us" actress "a class act."

"You were a huge part of his life (and actually there 😂) during that time ❤️," Decker added.

Previously, Decker joked that she harbored resentment toward Moore for dating Roddick when they were younger.

"I still harbor anger towards Mandy because she got his good years," Decker told told Access Hollywood in 2020 ahead of a fundraising roast event for her husband. "She got the hair, she got, like, the US Open championship, she got the good stuff."

Roddick collected 32 titles, including the 2003 US Open, throughout his professional tennis career. However, Decker revealed several years ago that he'd thrown away most of his trophies because they didn't define success to him.

The Andy Roddick Foundation founder announced his retirement at the 2012 US Open. Earlier this year, Roddick and fellow former tennis champ Andre Agassi won a $1 million purse after beating John McEnroe and Michael Chang in the first Pickleball Slam broadcast by ESPN in April.

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This article originally appeared on USA TODAY: Mandy Moore praises Andy Roddick, Brooklyn Decker with US Open tribute