NINE – Meet Caitlyn Jenner: Jenner reveals in July that she would no longer be known as Bruce Jenner, sparking a dialogue about what it means to be transgender. The 1976 gold medal-winning pentathlon men’s champion’s cover story on Vanity Fair, and follow-up television interviews helped broaden the world view on people who identify themselves as transgender.

EIGHT – Olympians Serena Williams and Novak Djokavic Win 3/4 of their Grand Slams: Williams won the Australian Open, the French Open and Wimbledon in 2015. She is a four-time gold medalist, winning gold in doubles in 2000, 2008 and 2012, as well as the singles championship in 2012. Djokavic won the Australian Open, the French Open and Wimbledon in 2015. Djokavic now has a total 10 Grand Slams, and took the bronze medal in singles play in Beijing in 2008.

SEVEN – Barcelona FC Wins the Treble: In the 2014–2015 season, Barcelona win La Liga, Copa del Rey and UEFA Champions League titles, becoming the first European team to have won the treble twice. Olympians on Barcelona FC include Javier Mascherano (gold for Argentina in 2004 and 2008), Lionel Messi (gold for Argentina in 2008), Neymar (silver for Brazil in 2012), Luis Suarez (competed for Uruguay in 2012)

See this link for 13 through 15, and 10 through 12.