At this year’s Wimbledon, some of the most famous names in women’s tennis are once again lending their support to the StarCards charity auction, raising money for Great Ormond Street Children’s Hospital in London.

The WTA has been helping the charity since 2002, raising thousands of pounds. Among the lots at this year’s auction are items from Serena Williams, Agnieszka Radwanska, Caroline Wozniacki and StarCards’ official celebrity supporter Ana Ivanovic, who has signed and donated her 2016 French Open player accreditation.

“With the tremendous support of the WTA we have raised over £100,000 for the charity, tennis fans around the world each year contact us in advance of to make sure they don’t miss out on the new collection. We are extremely grateful to the WTA and our official supporter Ana Ivanovic who help us every year to raise funds for Great Ormond Street Hospital Children’s Charity,” StarCards founder Paul Bretta said

The auction, held on the StarCards website, started on June 30 and will finish on July 10.

@serenawilliams thanks for supporting #wta #Wimbledon charity auction for @GreatOrmondSt at https://t.co/9day5Ddgf4 pic.twitter.com/XumMa8kAlE

— StarCards (@STARCARDS4GOSH) 27 June 2016