9-year-old Serena Williams spoke to CNN about her tennis aspirations 2:58 (CNN) — Serena Williams’ legendary tennis career may have come to an end after falling to Australia’s Ajla Tomljanović in the third round of the US Open at Arthur Ashe Stadium in Flushing, New York. The 23-time Grand Slam singles champion leaves an indelible mark, not just on tennis, but on the entire sport. Tomljanović, who won 7-5 6-7(4) 6-1, advances to the US Open round of 16 for the first time. Serena Williams, a before and after in sports 3:16