Boris Becker, former tennis champion, went on trial on Monday for concealing property from bankruptcy trustees.

The case's prosecution says the 54-year-old "acted dishonestly" by hiding or failing to hand over assets before and after he was declared bankrupt in June 2017 and is currently charged with 24 counts under insolvency laws.

The assets, according to the prosecution, include trophies such as the 1985 and 1989 Wimbledon men’s singles title, his Australian Open trophies from 1991 and 1996, and his 1992 Olympic gold medal.

Even more so, the defendant is accused of concealing $1.25 million from his sale of a Mercedes dealership he owned in German, of failing to declare two German properties, and of hiding a $900,000 bank loan.

Becker, the former world No. 1 and six-time Grand Slam champion, denied all charges.

The trial is expected to last for several weeks.