Russian star bounces back with straight-sets win in Stuttgart.
Sharapova is making her return from a 15-month doping ban on 26 April in Stuttgart.
Zverev has lost all three of his meetings with Nadal, including their last outing in Monte-Carlo.
Federer has recorded three consecutive wins over Nadal for the first time since their rivalry began in 2004.
Russian faces Roberta Vinci in first round on Wednesday [26 April] after being given wildcard for WTA event.
Federer has won three of the four tournaments he has played in 2017.
Murray will begin his Barcelona campaign against Dustin Brown or Bernard Tomic on 26 April.
"I have said it once and I'll say it again, this world has come so far but yet we have so much further to go"
Nadal became the first player in the Open Era to win a single ATP event - the Monte-Carlo Masters - 10 times
Bogdan Obradovic believes the rejuvenated Federer can give Djokovic some advice.
Giorgio di Palermo believes Federer and Nadal have made fans love the game and will keep following it.
Nadal is looking to make history and win in Monte-Carlo for the 10th time.
Nastase was escorted off court and Konta went onto secure 6-2 6-3 win.
Sharapova will return from her 15-month suspension in next week's Porsche Tennis Grand Prix.
Nastase made the comment on Friday (21 April) during the Fed Cup draw.
Nadal is aiming for his 10th title at the ongoing Monte Carlo Masters.
Goffin handed Djokovic his fourth loss of the year on Friday (21 April).
Rusty world number one opts for Catalonia over Budapest as French Open preparations continue.
Federer is on an eight-week break from the ATP Tour after winning three titles in his first four tournaments.
Becker also said the French Open will be 'extremely exciting' this year.
The American's absence from the sport will be closely felt as Maria Sharapova prepares for her comeback.
Albert Ramos-Vinolas clinches victory over the returning Briton.
Federer has taken an eight-week break after his Miami Masters win.
Federer has made his best start to a season since 2006 winning three titles thus far.
35-year-old divulged the news on Snapchat.
Fellow Briton Kyle Edmund fights back from first-set bagel to push Rafael Nadal hard in losing effort.
Nadal has made three finals in 2017 but is yet to win a title having lost two finals to Federer.
World number one faces Giles Muller in first match for five weeks in the principality.
Djokovic returned from injury to progress to the third round at the Monte-Carlo Masters.
Nadal has had serious knee injuries during the course of his career.