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Steffi Graf and Andre Agassi married in 2001 and still pair up in mixed doubles exhibition matches. Getty Images
Graf's gold medal in Seoul in 1988 followed her victories in all four grand slams that year, the so-called "Golden Slam." Getty Images
Graf holds aloft the 1988 Australian Open title, the first leg of her "Golden Slam" that year. Getty Images
Graf beat seven-time winner Martina Navratilova in the final as she won her first Wimbledon title in 1988 at the tender age of just 18. Getty Images
Agassi won Olympic gold in 1996 at Atlanta, and showed just how much it meant to him at the victory ceremony. Getty Images
When Agassi won the French Open in 1999 he completed the set of winning all four grand slams and an Olympic gold medal. Only Rafael Nadal has also achieved this feat in the men's game. AFP/Getty Images
Graf shares a moment in the Royal Box at Wimbledon 2012 with the Duchess of Cambridge, Kate Middleton. Getty Images