At 36mm, the watch is also elegant with diamond hour markers and a ceramic bezel. According to Tag Heuer’s website, the caseback is adorned with the tennis star’s official logo: a bear holding a flower, a symbol of strength and femininity. It is limited to 300 pieces and is exclusively available in the United States, Japan and Australia for US$4,050.

Hong Kong’s 10 richest billionaires of 2023, revealed

6. Maria Sharapova – Tag Heuer Carrera Lady (US$4,100)

Osaka’s predecessor, Russia’s legend Maria Sharapova, collected dozens of different models from Tag Heuer for herself after becoming its ambassador in 2004 when she was only 17, she once shared in an interview. Among them, her favourite line was Carrera and her Carrera Lady had the heftiest price tag: US$4,100.

The timepiece has the feminine size of 32mm with white mother-of-pearl hands and hour markers on the dial as well as a bezel with 64 diamonds. It also has a stainless steel band and water resistance up to 100 metres.

5. Andy Murray – Rado HyperChrome Automatic Chronograph (US$5,600)

Andy Murray won his first Olympic gold in 2012 – the year that he also signed with Swiss watch brand Rado. He picked the Rado HyperChrome Automatic Chronograph to wear during tournaments.

From the HyperChrome family introduced in exactly the year that Murray became the brand’s ambassador, the dynamic, sleek and sporty watch is created for both businessmen and sport enthusiasts, according to Rado.

With a large 45mm size, it showcases the brand’s strength in its hi-tech ceramic case and bracelet for an elegant and sporty look with three shades of grey, brown, white, black and a gold tone on the dial. It also has three-dimensional subdials as frames overlapping one another. Its listed price is around US$5,600.

Move over, Elon Musk: who’s the richest billionaire in 2023?

4. Novak Djokovic – Hublot Big Bang Meca-10 (US$24,100)

From the brand’s flagship Big Bang model, the timepiece features a 45mm case made from micro-blasted and polished blue ceramic topped with a matching bezel.

Beneath its sapphire crystal, the matt blue skeletonised dial displays its movement. It also has a seconds subdial at nine o’clock and a cog wheel power reserve indicator at six o’clock. It has a power reserve of 10 days and is water resistant up to 100 metres. The watch costs US$24,100.

3. Roger Federer – Rolex Daytona Orange (US$360,000)

Roger Federer and Rolex are two Swiss legends who have come together. The long-time brand ambassador for Rolex has sported its iconic and latest models, from the Oyster Perpetual and Day-Date to Daytona, both on and off the court over the years.

Among them, the Daytona Orange appears to be the most valuable one. It is made of 18k yellow gold with a black dial with 11 baguette-cut orange sapphire hour markers and a bezel mounted with 32 baguette-cut orange sapphires, fitted on an Oysterflex strap. It also has three sub-dials and a 72-hour power reserve. Chrono estimated its price at about US$360,000.

Paul Newman’s two Rolex Daytonas could fetch a million each at auction

2. Serena Williams – Audemars Piguet Royal Oak Black Panther (US$650,000)

The 23-time Grand Slam winner and Audemars Piguet’s partnership began in 2014. The queen of the court has opted for many models from the brand’s symbolic Royal Oak collection.

In 2021, Serena Williams showed off one of the 250 limited pieces of Royal Oak Black Panther Flying Tourbillon, a collaboration between the brand and Marvel. The 42mm watch features a titanium case and a black ceramic bezel and crown. More importantly, the dial features a 3D sculpture of the superhero Black Panther hand-painted in white gold and the inner bezel in purple to mimic the colour of vibranium – a fictional purple metal in the Black Panther lore – straddling a pulsating tourbillon.

Its retail price was US$176,000, however, Christie’s estimated it currently costs up to US$650,000. In 2021, its unique version in 18k white gold for the case and bezel created to raise charity funds was sold for US$5.2 million, making it the most expensive Audemars Piguet model ever sold.

1. Rafael Nadal – Richard Mille RM27-04 (US$2.3 million)

“The King of Clay” never wore a watch on the court until he became the face of Richard Mille in 2010. Rafael Nadal actually works with the brand to make special watches for him on the court costing six or seven figures, according to Wrist Enthusiast.

The Beckhams’ 5 most expensive watches, ranked

In 2020, the Richard Mille RM27-04 was designed to celebrate a decade of their fruitful collaboration, reportedly becoming his most expensive watch. It has a unique dial that’s reminiscent of tennis racquet strings across it. The “strings” reportedly hold the movements over the course of a tennis match. The suspended tourbillon calibre can also withstand accelerations of more than 12,000g – a new resistance record for the brand.

The case is made of a brand new material called TitaCarb exclusive to Richard Mille and titanium, which helps the watch weigh just 30 grams including the blue textile strap. Limited to just 50 pieces, it costs over US$2.3 million on the secondary market, per Chrono.