Djokovic clinches sixth year-end No. 1 ranking to tie with Sampras

Why rhythm is important in tennis

Sportstar Archives: Pete Sampras - In Laver’s footsteps

Rafael Nadal reclaims number one rank from Novak Djokovic

Djokovic 'couldn't be happier' after fifth Paris Masters title

Paris Masters: Djokovic sets up quarterfinal clash with Tsitsipas

The Americans are coming — back

New-look Davis Cup set for litmus test

Federer fires ominous Djokovic warning to rivals

Djokovic lands US Open title to match Sampras' 14 majors

Djokovic reveals hike in France key to improved form

US Open: Djokovic triumphs, picks up 14th Grand Slam title

Djokovic eyes Sampras mark in Del Potro US Open final duel

US Open 2018: Federer's last chance to surpass Connors and Sampras?

Isner defends title for fifth Atlanta crown

Stich: No player is bigger than the sport

Federer 20: The Swiss great's five biggest grand slam wins

Variety and deception in serving