The Serbian's 19th successive win ended any chance of Spain's Carlos Alcaraz overtaking him in the rankings this week.
Sumit Nagal registered a straight sets victory against Canada's Gabriel Diallo on his debut at the Miami Open.
Norway's Casper Ruud won his first Masters 1000 title on Sunday, as he stormed to a 7-5, 3-6, 6-4 victory over fifth seed Jack Draper in the Madrid Open final with a gutsy performance that showcased his clay-court mettle.
Riding on his sizzling performance in the Japan Open, Leander Paes is once again knocking the doors of the top-five zone as he gained two spots to be placed sixth in the ATP doubles world rankings, issued on Monday. Paes and Lukas Dlouhy reached the final of the Japan Open last week but lost the summit clash, missing out on the opportunity to pocket back-to-back ATP titles.
This milestone underscores his longevity and commitment to the sport, especially considering the physical and mental demands of playing at the top level.
Jannik Sinner won his maiden Grand Slam title at the Australian Open on Sunday.
Prakash Amritraj's brilliant run at the Newport ATP had pole vaulted him from 305 to 204 in the Ranking charts.
Sumit Nagal will take on Tomas Machac of the Czech Republic in the opening round of the Australian Open
Factbox on Carlos Alcaraz, who beat seven-time champion Novak Djokovic
Rafael Nadal won two Grand Slams this year -- the French Open and the US Open -- to move within one of Roger Federer's record of 20 titles.
The United States-based players displaces Davis Cupper Rohan Bopanna.
Yuki Bhambri claimed his maiden ATP title as he along with South Africa's Lloyd Harris of South Africa won the doubles title in the ATP tennis tournament in Mallorca
In the doubles draw, Indian pair Siddhant Banthia and Parikshit Somani beat compatriots Sai Karteek Reddy Ganta and Vishnu Vardhan 6-3, 3-6, 10-7 to book their spot in the quarter-finals.
Davis Cup heavyweights Australia and the United States eased through the first qualifying round on Saturday but Britain were knocked out as Japan hit back from 2-1 down to win 3-2, while Denmark staged a dramatic comeback to overcome Serbia.
Nagal is likely to reach a new career-high ranking of world No. 92
Nagal said he would look to play more ATP Tour events this year but for that he would have to first improve his rankings.
Continuing to reclaim lost ground in the ATP rankings, Somdev Devvarman jumped 65 places to 250th to be India's best-placed singles player in the list issued on Monday.
Medvedev outlasts Zverev to reach Halle final
Fonseca cruised through the first set before Fearnley found his groove in the second to level the match on a windy day in the California desert.
The buzz around talented teenagers Mirra Andreeva and Joao Fonseca continued at Indian Wells on Wednesday.
Japan's Kei Nishikori dispatched error-strewn Swiss Stan Wawrinka 6-2, 6-3 in a disappointingly one-sided clash at the ATP World Tour Finals on Monday.
The ranking of India's injured singles stars has dipped with Sania Mirza slipping to 88 from 81 and Somdev Devvarman sliding to 70, a loss of five places, in the latest WTA and ATP ranking charts.
The 19-year-old Czech Jakub Mensik beat his childhood idol Novak Djokovic in the Miami Open final in an upset for the ages on Sunday.
Somdev Devvarman's stay in the top-100 lasted just a week, as the Indian suffered a huge loss of 15 positions to find himself at 111th spot in the latest ATP rankings. In the WTA rankings, Sania Mirza's slide continued, The Indian ace found herself at No 153 after a loss of 15 places.
Top seed Carlos Alcaraz withstood a charge from qualifier Luca Nardi for a 6-1, 4-6, 6-3 victory in the second round of the Qatar ExxonMobil Open in Doha on Wednesday.
Meanwhile, Sumit Nagal was trailing in his second round men's singles match against Holger Rune of Denmark, when rain led to a suspension of the contest.
Rohan Bopanna achieved his career-best rank of 19 in the doubles ATP chart following his stupendous run at the US Open, where he was the runners-up along with doubles partner Pakistan's Aisam-ul-Haq Qureshi.
24-year-old Sebastian Baez, who is looking to become the first two-time Rio Open champion, will take on Alexandre Muller after the Frenchman beat Francisco Comesana 7-5, 6-7(3), 6-3 in a marathon battle.
India's singles star Somdev Devvarman, who will return to action this week, has suffered a steep slide of 19 places to 89 in the ATP rankings, issued on Monday.
Here is a quick glance of all the highs and lows from Nadal's stupendous career:
Russian Andrey Rublev was given a tough test early on, but finished in style to beat Britain's Jack Draper and win the Qatar Open.
The victory saw him move up by three places to stand only behind Spain's Rafael Nadal and Swiss star Roger Federer.
Says he is one 'big injury' away from retirement.
India's ever-improving singles tennis player Somdev Devvarman on Monday gained two positions to jump to a career best 94 in the latest ATP rankings chart.
Sania Mirza, struggling to recover from a wrist injury, moved one place up to 31 in singles and gained three spots in doubles to be 22 in the latest WTA tennis rankings.
No. 2 seed Casper Ruud of Norway will take on unseeded Denis Shapovalov of Canada in the Dallas Open final on Sunday after both notched semi-final victories.
Agassi remains top of the 12-month rankings with 4,090 points followed by Ferrero and Federer.
Russian Andrey Rublev has become the fifth singles player to qualify for the season-ending ATP Finals in Turin next month, the men's tour said.
Three-time champion Novak Djokovic battled past Frenchman Corentin Moutet in a match that lasted more than three hours on Thursday.