In contrast , Federer , also born in 1981 , did n't win his first professional tennis tournament until 2003 ( Wimbledon ) .
Serena Williams , born in 1981 , won her first professional tennis tournament ( the US Open ) in 1999 .
Federer , also born in 1981 , did n't win his first professional tennis tournament until 2003 ( Wimbledon ) .
Serena Williams , born in 1981 , won her first professional tennis tournament ( the US Open ) in 1999 .