Djokovic climbed one spot up to second after claiming the Shanghai Masters title for the fourth time in a row.
Novak Djokovic has now been victorious in 18 ATP matches in a row and in recent months won Wimbledon, the Cincinnati Masters, the US Open and now Shanghai for a fourth time.
Novak Djokovic and Borna Coric kept fans on the edge of their seats with an incredible rally during the first set.
Roger Federer has not been at his best all week, dropping sets in the two opening matches of his wobbly title defence.
Earlier this week, Fernando Verdasco had berated a ball boy at the Shenzhen Open for failing to bring his towel fast enough.
The 17-time Grand Slam champion has also given shelter to the flood victims in his tennis academy.
The hilarious incident that took place during a Shanghai Masters match was caught on camera and quickly went viral.
Roger Federer was given a huge scare before finally seeing off Russia's Daniil Medvedev to open his Shanghai Masters defence in unconvincing fashion.
Fernando Verdasco has not commented on the incident when he aggressively gesticulated at a ball boy to hurry up during last month's Shenzhen Open in China.
Australian Nick Kyrgios was on the end of a surprise first-round loss to the American qualifier Bradley Klahn, the world number 104 winning 4-6, 6-4, 6-3.
Roger Federer remains behind Nadal with 6,900 points. And in the WTA rankings, Japan's Naomi Osaka jumped two positions to the fourth spot.
Novak Djokovic, who was absent for six months from competition in 2017, has been prolific in 2018.
Alexander Zverev came from a set down to beat Kevin Anderson as the Europeans successfully defended the title won in Prague last year.
Team World slashed Europe's overall lead to 7-5 heading into Sunday's third and final day of the 2018 Laver Cup.
The doubles dream team of Roger Federer and Novak Djokovic lost their match but Team Europe still led Team World 3-1 after the first day of Laver Cup.
Roger Federer said if he does opt to play the clay-court season it will require a significant tweak of his training regime.
From eating fish eyeballs to dropping down into a gorge, fans will get to know Roger Federer's adventurous side.