List of ATP number 1 ranked doubles tennis players - Wikipedia

2010 ATP World Tour - Wikipedia

Carlos Alcaraz becomes second fastest to win 100 ATP matches after John McEnroe, overtakes Andre Agassi, Rafael Nadal and others

2009 Italian Open (tennis) - Wikipedia

Djokovic–Federer rivalry - Wikiwand

The Shortest Men's Tennis Players of All Time, Ranked Best to Worst

Tennis records and statistics: Tennis performance timeline comparison, World-number-one male tennis-player rankings

List of ATP number 1 ranked doubles tennis players - Wikipedia

List of ATP number 1 ranked singles tennis players - Wikipedia

Proud of my career but I never became No. 1 because there was Federer, Nadal or Djokovic: Juan Martin del Potro

Sinner enjoys double success over Djokovic to lead Italy into the Davis Cup final