Jim Courier | The Business Standard

FILE PHOTO: Tennis - Davis Cup - World Group Semi-Final - Croatia v United States - Sportski centar Visnjik, Zadar, Croatia - September 15, 2018 U.S. team captain Jim Courier reacts during the doubles match between Mike Bryan and Ryan Harrison of the U.S. and Croatia's Ivan Dodig and Mate Pavic. Reuters

Grand Slams will be up for grabs as big three wane, says Courier

Roger Federer, Rafa Nadal and Novak Djokovic have won the last 11 Grand Slams between them and an incredible 54 since 2003.