2. The Serena Slam
Serena has the honor of holding all the Grand Slam titles at the same time, two times. In case you have no idea what that means, there are four Grand Slams – the major tournaments held every year: The Australian Open; The French Open; The British Open (Wimbledon); and The US Open. Winning all four grand slams and the Olympic title in a calendar year gives you the Golden Slam – last achieved by Steffi Graf in 1988.