Dušan Vemić
Even though Dušan Vemić retired from being a tennis player in 2011, he has continued as a tennis coach. His coaching skills brought Andrea Petkovic to the WTA rank of number 9. He was known for his fast serves and made his mark when he served at 235 km/h (146 mph) at the 2008 Countrywide Classic making him the 22nd fastest server ever.
Venus Williams
Older sister of Serena Williams, Venus made history way before she served the second fastest serve by a woman at 207.6 km/h (129.0 mph) at the 2007 US Open. She has achieved seven Grand Slam singles titles as well as being ranked number one by the WTA on 3 different occasions.