In the World of Professional Tennis during the Modern Era only twice thus far have there been
four different men and four different women Slam Champions within a Calendar year.
1990
Australian Open
Ivan Lendl
Steffi Graf
French Open
Andres Gomes
Monica Seles
Wimbledon
Stefan Edberg
Martina Navratilova
US Open
Pete Sampras
Gabriel Sabatini
1998
Australian Open
Petr Korda
Martina Hinigs
French Open
Carlos Moya
Aranxta Vicario
Wimbledon
Pete Sampras
Jana Novotna
US Open
Patrick Rafter
Lyndsay Davenport