The six-time Grand Slam winner is on trial for 24 charges relating to his bankruptcy in 2017, linked to a loan of 3.5 million euros from a private bank, Arbuthnot Latham, for a property in Spain.

The former world number one is notably accused of not having handed over, to pay off his debts, nine of the trophies he has won throughout his career, including two of his three Wimbledon cups, a trophy from the Australian Open and his Olympic gold medal won in 1992.

"Mr. Becker maintains that he does not know where these assets are," prosecutor Rebecca Chalkley told the court.

According to her, this statement is "fanciful" and the tennis player "deliberately withholds" the trophies.

Replicas of trophies (including Wimbledon, centre), medals and other memorabilia won during his career by former German tennis player Boris Becker are displayed ahead of their auction on June 21, 2019 in Hemel Hempstead , north of London - WYLES HARDY/AFP/Archives

Mr Becker claimed the missing trophies were of "no significant value" or "great interest" to him.

"Bearing in mind what (these trophies) represent in terms of accomplishment and sacrifice for Mr. Becker over the years, the fact that they are not of great interest, regardless of either their monetary value, lack of credibility,” added the prosecutor.

"These trophies are among the most important of Mr. Becker's career," she said.

"It's not believable that he doesn't know where they are."

Boris Becker is also suspected of having concealed 1.13 million euros from the sale of a Mercedes dealership he owned in Germany, paid into his Boris Becker Private Office (BBPOL) account.

According to the prosecution, "Mr. Becker used the BBPOL account as an extension of his own account, like his own piggy bank, for day-to-day expenses like school fees for the children," prosecutor Rebecca Chalkley said.

Among the payments made in 2017 were £643 to Polo Ralph Lauren, £7,600 in tuition fees and £976 to London luxury store Harrods.

He had also paid large sums to his ex-wife Barbara Becker, and his estranged wife Lilly.

He would also have transferred 300,000 euros to his own account, while other funds were transferred to an account he held with his son Noah.

He is also accused of not having declared two properties in Germany, as well as interests in a London apartment and of having hidden a loan of 825,000 euros.

German Boris Becker lifts the US Open trophy after his victory in the final against American Ivan Lendl on May 30, 2022 at Flushing Meadows AFP / Archives

Becker, who has won 49 titles during his 16-year career, is supported in court by his partner Lilian de Carvalho Monteiro.

He disputes all the offenses with which he is charged.

The trial is expected to last up to three weeks.

© 2022 AFP