File:Tennis grand slam big three.svg - Wikimedia Commons
Serena Williams Wins Australian Open With Coughs, Guts and Aces - The New York Times
Vancouver, Canada. 2nd May, 2015. Winner of 14 Grand Slam titles Pete Sampras returns the ball against 17 Grand Slam titles winner John McEnroe during the PowerShares Champions showdown tennis tournament in
Past Tennis Grand Slam Winners: See Photos of Them All | Time
Serena Williams wins 19th Grand Slam tennis title - The Columbian
Chart: The Youngest Grand Slam Champions | Statista
Serena Williams wins 19th Grand Slam title at Australian Open - National | Globalnews.ca
Tennis: Results and statistics of the four Grand Slam tournaments Women's Singles and Men's Singles 2015 Edition: Langlois, Natalie, Langlois, Kevin: 9781522741688: Amazon.com: Books
2015 ATP World Tour Finals - Wikiwand
Wimbledon 2015: Serena Williams Defeats Garbiñe Muguruza and Closes In on Grand Slam - The New York Times
AroniSmart - Serena Williams beats Maria Sharapova and wins Her 19th Grand Slam title.
Roberta Vinci Ends Serena Williams's Grand Slam Bid at U.S. Open - The New York Times
Wimbledon 2015: Winners and Losers from All England Club | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
WIMBLEDON 2015: Serena Williams halfway to true Grand Slam
De Groot wins 9th straight Grand Slam wheelchair title | AP News
Most Tennis Grand Slam Title Winners
2015 Serena Williams tennis season - Wikipedia
Federer, Nadal, Djokovic: Road from the 1st to the 20th Grand Slam Title
Grand slam winners record: How Djokovic, Nadal and Federer compare in race for the most men's tennis titles
Statista on Twitter: "The Big Three (ie. #Federer, #Nadal and #Djokovic) won 58 of the past 69 Grand Slam tournaments, with Andy Murray and Stan Wawrinka the only other players to notch
Chart: Federer-Nadal: A Rivalry for the Ages | Statista
U.S. Open 2015: Rafael Nadal exits Flushing Meadows after humbling defeat | CNN
U.S. Open: Flavia Pennetta wins all-Italian final, retires from tennis | CBC Sports
Serena Williams wins 2015 French Open, 20th career Grand Slam title - Sports Illustrated
