Kate's at the court of Queen Emma: Royal wows Raducanu with 'incredible forehand' as the pair don premium sportswear with the Duchess in a £155 Poivre Blanc ensemble and the Tennis ace in Nike as she wields a £210 Wilson racket

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It was the day when the queen of the court met the future Queen.

And if new US Open champion Emma Raducanu thought the Duchess of Cambridge would be a pushover, the royal soon proved her mettle.

The 18-year-old tennis prodigy declared that she was 'very impressed', adding: 'Her forehand was incredible!'

The pair met at an official 'homecoming' organised by the Lawn Tennis Association yesterday following Miss Raducanu's historic victory at Flushing Meadows in New York earlier this month.

Alongside her at their base in Roehampton, south-west London, were three other British success stories: Joe Salisbury – who won in the doubles pairing at the US Open – and doubles players Alfie Hewett and Gordon Reid, silver medalists at the Tokyo Paralympics.

Kate, 39, who is patron of the LTA, is tennis-mad and a pretty handy player to boot. The knock-about started with Sam Richardson, the LTA head of programmes, telling the group not to be too competitive.

'How many Grand Slam titles have we got on the court?' he joked. But his plea for them to take it easy was quickly forgotten as the duchess and Miss Raducanu played against the wheelchair pair.

'It's getting competitive already!' Mr Richardson said after one scorching rally.

Both Kate and Emma had some impressive kit for their matches. The teenager used a Wilson racket and wore Nike from top to toe, including a £107 pair of trainers and a top that is not yet available for the general public to buy.

Meanwhile, the duchess went with a Babolat racket. She sported a Poivre Blanc top (£90) and skirt (£65) as well as £130 'The Roger' trainers, designed by Roger Federer, who by coincidence happens to be a good friend of the Middleton family.

Federer is known to have faced the duchess across the court privately and was even said to have challenged her husband, Prince William, to a game of table tennis at Pippa Middleton's wedding.

Yesterday, as the five played in various different combinations, the tennis became fast and furious, with some long rallies.

When it was Miss Raducanu's turn to sit out she took it upon herself to be the ballgirl instead. 'My new job!' she laughed. 'I always wanted to be a ballgirl.' 

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Both Kate and Emma had some impressive kit for their matches. The teenager used a Wilson racket and wore Nike from top to toe, including a £107 pair of trainers and a top that is not yet available for the general public to buy. Meanwhile, the duchess went with a Babolat racket. She sported a Poivre Blanc top (£90) and skirt (£65) as well as £130 'The Roger' trainers, designed by Roger Federer, who by coincidence happens to be a good friend of the Middleton family.

Doubles with the Duchess! Kate Middleton met with US Open winner Emma Raducanu today and even played a match with the teenage tennis sensation

The Duchess of Cambridge wore a sporty tennis skirt for the occasion, which she wore with a zip-up jacket from French sportswear brand Poivre Blanc

Kate showed off her athletic prowess as she criss-crossed across the court during the session in the sunshine this morning

Victory! The Duchess of Cambridge reacted with joy as she played with British US Open Champion Emma during the event

To celebrate the success of the British US Open champions, the Lawn Tennis Association (LTA) is inviting the nation to come together for a special 'Homecoming' event. Pictured, Kate and Emma on the tennis court

The Duchess of Cambridge was beaming as she played a match with the US Open champions during the homecoming event

The Duchess of Cambridge beamed at Emma as they took to the court today for the homecoming event in London

The royal, a keen tennis fan, also showed off her skills as she played alongside Joe Salisbury during the session

Before the thirty-minute show, which will be broadcast live today at 12:30pm on BBC iPlayer and BBC Sport online as well as the LTA's social media channels, Emma (pictured left), 18, chatted with keen tennis fan Kate, who is patron of the LTA

The LTA youth initiative is an innovative programme aimed at inspiring the next generation of players aged 4-18, as well as helping more children enjoy the benefits of playing and staying in tennis, whatever their age, gender, ability or background. 

Sitting down to meet with the US Open champions, Kate gushed: 'Amazing guys, honestly. Congratulations. Seriously impressive. It's been so nice for all of you to come back here in your home country to celebrate back home.'

Kate congratulated Emma on her historic win at the US Open earlier this month in New York, after writing a personal Tweet of support in which she signed off with a 'C'.

The royal mother-of-three is often seen at Wimbledon; this year she was all-smiles when watching the women's final, which saw Australian contender Ash Barty win over Czech player Karolina Pliskova at Centre Court.

Alongside the tennis court appearances, the event included a live Q&A and a host of tennis activities - giving fans and players of all ages an opportunity to get to know their sporting heroes and hoping to inspire a new wave of players to start their tennis journey. 

Emma and Kate clearly enjoyed each other's company as they took to the court at the National Tennis Centre in London

The Duchess of Cambridge and the teenager tennis sensation chatted happily together during their match

Oh dear! Kate looked less than impressed with herself during one portion of the match, and placed her hand on her head

Kate (pictured left), 39, who has returned to work following her annual summer break, looked appropriately sporty in a blue tennis skirt and matching zip-up jacket for the visit at the National Tennis Centre in London

Before the group picked up their rackets the duchess (pictured playing with Emma) told the champions: 'Amazing guys, honestly, congratulations to all of you - it's seriously impressive.'

The professional! Emma appeared to be taking the game seriously as she brandished her racket while playing with Kate

Sharing a smile: Kate couldn't help but keep the grin on her face while playing with Emma, who looked equally pleased

Kate and Emma worked together against other players such as Britain's tennis stars Alfie Hewett and Gordon Reid, who won the men's wheelchair doubles, and men's doubles champion Joe Salisbury

Great team work! The royal mother-of-three shared a laugh with the British US Open champion as they played tennis together

The Duchess of Cambridge talked to British US Open champions Emma and Gordon Reid as they returned to the LTA's National Tennis Centre for The Homecoming and to celebrate their success

Taking part and joining in! It appeared Kate and Emma worked well as a team as they jointly tried to win the game of tennis

Elsewhere, the Duchess of Cambridge, in her role as patron of the LTA, chatted to a group of children on the orginsation's Youth programme

Kate has returned to work following her summer break with her husband Prince William, 39, and their three children Prince George, eight, Princess Charlotte, six, and Prince Louis, three. Pictured, the duchess speaks with children attending today's celebration

Emma defeated Leylah Fernandez 6-4 6-3 at Arthur Ashe Stadium earlier this month to become Great Britain's first female grand slam winner in 44 years. 

It was only Raducanu's second appearance at a major and the new world number 23 has made headlines across the globe, appeared on various TV channels in the United States and also attended the Met Gala last Monday in a monochrome Chanel ensemble. 

After competing at Wimbledon this summer, Emma who is an LTA Youth Ambassador visited her old primary school in Bromley to inspire more young people to play the sport.

On visiting her primary school, Emma said: 'Being back here does make me want to do more because seeing their inspired and excited faces when I walk in spurs me on. I can't let them down and I want to keep pushing on in my own career. Hopefully they can get into tennis as well if they watch me.'

Emma (pictured) defeated Leylah Fernandez 6-4 6-3 at Arthur Ashe Stadium earlier this month to become Great Britain's first female grand slam winner in 44 years

Teenage tennis sensation Emma and Joe Salisbury in action as they return to the LTA's National Tennis Centre for the Homecoming today

What a pro! Emma made her tennis skills look effortless as she joined in the matches alongside the duchess and then tennis star Joe Salisbury

Playing doubles at the National Tennis Centre, Kate and Emma teamed up for their first matches, before swapping to opposite sides of the court. Pictured, Emma teamed up with Joe Salisbury

Can't stop smiling! Emma appeared to be in a great mood and in top form as she attended the homecoming event in London

Giving it her all! Kate looked on top form as she enjoyed a game of tennis with the professionals in On tennis shoes, developed with tennis player Roger Federer

Less game, more chat: The duchess and British US Open Champion took a moment to talk with one another when at the event

Taking it all in: The two women appeared to enjoy their discussion together as they paused their game at the homecoming

They mean business! Kate and Emma looked ready to play following their chat, with the duo seemingly determined to win

All in! The duchess Kate appeared to try her hardest when attending the event, brandishing a racket while in her on-point tennis kit

In the presence of a champion! The duchess appeared in awe as she watched 18-year-old Emma showcase her tennis skills

She added: 'Tennis is an unbelievable sport, it gives you so many opportunities and is so fun. It would be great for more kids to pick up a racket and try it. LTA Youth courses are a perfect way for everyone to get started.'

In 2018, Emma joined the LTA's Pro Scholarship Programme to give her the support that she needed including coaching, access to science and medical services and wildcards to tournaments. 

Emma has been competing in LTA competitions since aged seven starting out as a regular on the circuit of local and regional LTA tournaments across the south of England.

The tennis star, who only completed her A-levels earlier in the summer, achieving A* in mathematics and an A in economics at Newstead Wood School in Orpington, has been on a whirlwind ride since her historic win. 

Emma already has a clothing and shoe deal with Nike, a racquet tie-up with Wilson and she appears in the current edition of Vogue magazine. Most recently, she was revealed as Tiffany & Co.'s newest ambassador in a deal estimated to be worth more than £2million.

The duchess (pictured right) joined the homecoming celebration, hosted by the LTA Youth programme, in which four champions were on court alongside children taking part in the scheme

The Duchess of Cambridge meets British US Open Champions Emma Raducanu, Joe Salisbury (back row left) , Gordon Reid and Alfie Hewett (front row left)

The LTA youth initiative is an innovative programme aimed at inspiring the next generation of players aged 4-18, as well as helping more children enjoy the benefits of playing and staying in tennis, whatever their age, gender, ability, disability or background. Pictured, the duchess at the event

She announced on Instagram earlier this week that she had been named House Ambassador for Tiffany & Co., meaning she will support the brand by wearing its pieces. 

The tennis star wrote: 'Very excited to join the iconic @tiffanyandco family as a House Ambassador. Being able to wear these special jewellery pieces over the past few weeks has been an honour!'

According to popular culture and brand expert Nick Ede, Emma's new Tiffany and Co. deal is likely to be worth over £2million. 

'As LVMH have taken over the brand they are looking to attract a new audience and Emma is the perfect person for this,' he added. 'She exudes elegance and style but has an edge that will appeal to a new demographic, while not alienating the existing one.'

Emma has been heralded as a 'sponsor's dream' and is on course to become the highest earning female sports star of all time. It was also reported that she laid the groundwork for her potential earnings aged 17, registering Harbour 6 Limited to manage her finances.