#7 Magnus Norman
Blessed with immense talent and potential, Magnus Norman's tennis career lasted only 8 years on the ATP Tour as he was frequently plagued by injuries. Multiple hip and knee surgeries forced him to retire from the sport in 2004 at the age of just 27.
Norman reached a career-high ranking of World Number 2 in the year 2000 after he made the final at Roland Garros, losing to Gustavo Kuerten. He won the Rome ATP Masters event that year, this time beating his French Open conqueror Kuerten.
After a strong showing in the first two Grand Slam tournaments of the year 2000 coupled with a win at the Rome Masters and a few more titles to his credit, Norman was well on course to grab the World No. 1 ranking. However, knee issues began to bother him and he was forced to sit out the second half of the season despite being the most successful player until June that year.
Norman later took up the role of coach to players such as Thomas Johannson, Robin Soderling and Stan Wawrinka. He won the ATP Coach of the Year award in 2016.