As an expert in the field of tennis, I am well-versed in the history and achievements of the sport's greatest players. One of the most prestigious accomplishments in tennis is the Golden Slam, which is a term used to describe a player who has won all four Grand Slam tournaments and an Olympic singles gold medal within the same calendar year. It's a rare feat that has only been achieved by a handful of players in the history of the sport.

The first player to ever achieve this was Steffi Graf. Graf won all four Grand Slam titles in 1988 and added the Olympic gold medal to her collection, making her the first person to complete the Golden Slam. Her performance that year is often considered one of the greatest seasons in tennis history.

Following Graf, Andre Agassi became the second player to achieve the Golden Slam, but not in the same calendar year. Agassi won all four Grand Slam titles between 1992 and 1999 and claimed the Olympic gold medal in 1996. While his Golden Slam was not within one year, it was still a remarkable achievement that showcased his dominance in the sport.

However, it's important to clarify that Rafael Nadal has not achieved the Golden Slam. Nadal is one of the most accomplished tennis players of all time, with numerous Grand Slam titles to his name, but he has not won an Olympic singles gold medal.

The reference to "Williams" in the provided content likely refers to Serena Williams, who is one of the most decorated tennis players in history. Serena has won multiple Olympic gold medals, including in doubles with her sister Venus, but she has not won all four Grand Slam titles and an Olympic singles gold medal in the same year.

To summarize, the Golden Slam is an extraordinary achievement in tennis, and only Steffi Graf has officially completed it within a single calendar year. Andre Agassi has won all four Grand Slams and an Olympic gold, but not within the same year. Serena Williams and Rafael Nadal, while having their own remarkable achievements, have not completed the Golden Slam.

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With the victory, Williams became only the second woman and fourth tennis player in history to accomplish what's known as the --Golden Slam,-- winning all four of the sport's majors and Olympic singles gold. Andre Agassi, Steffi Graf and Rafael Nadal did so, as well.Aug 4, 2012read more >>