The stars of the WTA and ATP World Tour have been keeping very busy off the court in Cincinnati.
Lucie Hradecka was among them, paying a visit to the Cincinnati Children's Hospital Medical Center.
Lucie Hradecka was accompanied by ATP World Tour players Jean-Julien Rojer and Aisam-Ul-Haq Qureshi.
The three players spent time with the children, signed autographs for them and posed for photos.
Lucie Hradecka has been one of the very best doubles players in the world over the last few years.
With Andrea Hlavackova, Lucie Hradecka reached the doubles finals of both Wimbledon and the Olympics.
Maria Kirilenko also had big success at those events, reaching the quarterfinals of both in singles.
Sabine Lisicki also has a penchant for grass - one semifinal and two quarterfinals at Wimbledon.
Agnieszka Radwanska, the top seed in Cincy, signing autographs at the Western and Southern booth.
Camila Giorgi, one of the WTA's newest Top 100 players, also signed autographs on a busy kids day.
Christina McHale signed autographs too. The young American reached a career-high No.25 this week.
Caroline Wozniacki took some time out to visit the Western and Southern booth and sign for her fans.
Caroline Wozniacki is ranked No.8 in the world but does have 67 career weeks as the World No.1.
Caroline Wozniacki reached her first Grand Slam final on American soil, at the US Open back in 2009.
And Serena Williams has also had a lot of success on American soil - 17 of her 44 career WTA titles.