The seven-time champion was hoping to defend the title he won last year
Novak Djokovic has pulled out of tennis' season-ending ATP Finals due to ongoing injury problems.
The seven-time champion was hoping to defend the title he won last year.
Djokovic's season is now over - with the highlight being the career Golden Slam he achieved by winning gold at the Paris Olympics.
In the women's competition today in Riyadh, Iga Swiatek takes on Coco Gauff and Jessica Pegula faces Barbora Krejcikova.

New York City Defender Kevin O'Toole In Ireland Squad For Final World Cup Qualifiers
The Ireland Team Have Been Named For Their Game Against Japan
Thursday Morning Sports Update
Tipperary Have Seven Players Included On This Year's PwC Hurling All-Star Team
Ellistown's Michael Noonan Scores 1 of 4 Goals To Beat Panama In The Under-17 World Cup Campaign
Ireland U17's Make History As They Play In Today's FIFA U17 World Cup
Wednesday Morning Sports Update
Kildare Primary Schools Soccer Finals Results