Juan Martin del Potro survived three match points before claiming the championship in a third-set tie-breaker.
Juan Martin del Potro is looking for his 22nd career and second straight ATP title in a row after winning earlier this month in Acapulco.
Roger Federer, who is seeking a record sixth Indian Wells title, extended his win streak to 16 straight matches.
Roger Federer continues to defy the ageing process as he needed just 58 minutes to overpower the Serb with a brilliant display of Swiss timing.
Roger Federer extended his 2018 win streak to 13 matches and has only dropped three sets from 34 played this year.
After suffering with injuries and battling talented rivals in recent years, the Swiss tennis star is back in the No. 1 ranking and says he'd like to reach the milestone of 100 career tournament titles.
The 36-year-old Federer, who has won the event in the California desert five times, is defending 1,000 ranking points in the Coachella Valley.
Roger Federer remained at the number one spot with 10,060 points.
Swiss tennis icon Roger Federer won his fifth and sixth Laureus statuettes, becoming the most decorated Laureus winner in history at the 2018 awards ceremony in Monaco on Tuesday.
Rafael Nadal said he is not motivated by a desire to reclaim the position from Roger Federer.
Roger Federer, the oldest No.1 in history, thrashed Bulgarian Grigor Dimitrov 6-2, 6-2 in a one-sided final.
Roger Federer celebrated becoming the oldest man to reach the world number one ranking by making the Rotterdam Open final with a 6-3, 7-6 (7/3) victory over Italy's Andreas Seppi.
Fourteen years after first grabbing the number one ranking, the 36-year-old Swiss maestro is back on top of the world, the oldest man to achieve such a feat in the sport's history.
It is Roger Federer's first time back at the summit since October 2012 having first claimed the top position in February 2004.
Roger Federer would surpass Andre Agassi, who held the top spot in 2003 aged 33 years and 131 days. It would be Federer's first time back at the summit since October 2012 having first claimed the top spot in February 2004.
Rafael Nadal is leading the latest ATP Rankings with 9,760 points while Caroline Wozniacki leads the Women's list with 7,965 points.
Roger Federer lies just 155 points behind the injured Nadal in the standings, with a possible 180 points available for making the last four in Rotterdam.
The 36-year-old Swiss marvel continues to defy the years and attrition rate, reaching his 30th Grand Slam decider and claiming his sixth Australian crown and 20th Grand Slam title.