Federer has already won the 2017 Australian Open, where he defeated Nadal in the final.
Nadal will be among the favourites to win the 2017 Monte Carlo Masters.
Sharapova says it is not correct for fellow professionals to keep criticising her.
Murray has returned to action after recovering from an elbow injury.
Nadal is aiming to make it 10 titles at the Monte Carlo Masters.
The 35-year-old plans to rest up ahead of the French Open.
Federer has committed to playing at his home ATP tournament in Basel at least until 2019.
Federer has risen from world number 17 to world number four in less than three months.
Spain crashed out of the competition after defeat to Serbia at the quarter-final stage.
World number one lost 3-6, 6-7 to 18-time Grand Slam champion at Zurich's Hallenstadion.
Federer has won three titles in 2017 and lost just once in his last 20 matches.
Federer has made his best start to a season since 2006 capturing three titles thus far.
World number one targets French Open return but still unable to serve properly.
Former French Open champion discusses Federer's renaissance and Rafael Nadal's clay campaign.
Kyrgios helped Australia advance to the semi-final of the Davis Cup.
With 91 career singles titles, Federer is behind Ivan Lendl (94) and Jimmy Connors (109) in the all-time list.
Great Britain eliminated after 4-1 defeat to Yannick Noah's team in Rouen.
Djokovic has defeated Nadal in their last three meetings on clay.
Jamie Murray and Dominic Inglot lose in four sets to Nicolas Mahut and Julien Benneteau in Rouen.
Sharapova will return from her doping ban at the end of April.
Federer has beaten Nadal four times in a row for the first time in his career.
Lucas Pouille and Jeremy Chardy hand hosts comfortable lead in Rouen.
Andy Murray overtook Djokovic to become the new world No 1 ranked player late last year.
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.
John Isner and a celebrity partner will provide opposition for duo at April's Match for Africa 4 event.
Djokovic's elbow injury saw him withdraw from the recently concluded Miami Open.
Federer "would not stand a chance" against 2016 version of Djokovic, says Janko Tipsarevic.
Federer won the Miami Open after defeating Rafael Nadal in straight sets in the final.