Spain crashed out of the competition after defeat to Serbia at the quarter-final stage.
Former French Open champion discusses Federer's renaissance and Rafael Nadal's clay campaign.
With 91 career singles titles, Federer is behind Ivan Lendl (94) and Jimmy Connors (109) in the all-time list.
Djokovic has defeated Nadal in their last three meetings on clay.
Federer has beaten Nadal four times in a row for the first time in his career.
Federer and Nadal hold the record for most Grand Slam finals played between two players - nine.
Federer, Nadal and Djokovic have won 44 Grand Slam titles among them in the last 15 years.
Nadal is favourite to retain his titles in the upcoming Monte Carlo Masters and Barcelona Open.
Djokovic's elbow injury saw him withdraw from the recently concluded Miami Open.
Federer won the Miami Open after defeating Rafael Nadal in straight sets in the final.
Nadal has contested in three finals in 2017 and is yet to win a title.
Federer won his third title of the 2017 season in Miami to add to his Australian Open and Indian Wells wins.
Federer and Nadal will meet for the third time in 2017.
Nadal will take on Fognini in the first semi-final of the 2017 Miami Open.
Federer faces Nick Kyrgios for just the second time in the semi-finals.
Nadal defeated Jack Sock 6-2, 6-3 in the quarter-final clash on 30 March.
Nadal and Federer have faced each other 35 times since their first meeting in 2004.
Nadal faces France's Nicolas Mahut next in the round of 16.
Federer has made the best start to a season since 2006 winning two titles in his first three tournaments.
Nadal thinks he will be ready for the ATP tour without his uncle and longtime coach.
Agassi says he wished 'there wasn't a loser' in the 2017 Australian Open final clash.
Federer beat Nadal in the fourth round to record his third consecutive win over the Spaniard.