Daily Bagel: Maria Sharapova gets cover of Esquire in Bulgaria

The Daily Bagel is your dose of the interesting reporting, writing and quipping from around the Internet.
• Maria Sharapova is on the cover of Esquire in Bulgaria.
• Jeff Sackman at Heavy Topspin takes a look Kei Nishikori's Open Era-best 75-20 record in deciding sets.
• Based on this photo from Madrid, is Rafael Nadal switching back to his old Babolat racket?
Rafael #Nadal is already at work on Madrid clay
— We Are Tennis (@WeAreTennis) April 29, 2015
Photo : @MutuaMadridOpen pic.twitter.com/2p8nZuzwbc
• Interesting thoughts from Patrick Mouratoglou on how national systems can limit the ability produce champions:
The first one is the system and each country defines its own one with a way to train players insisting on parameters that are different in each system. For example, the Spanish system insists on hitting many balls on clay, with a lot of physical training for many hours. This helps developing a type of game that you need to be super fit and a big fighter to become a top player.
The second is the culture—if the country also promotes a certain kind of behavior. For example, the French mentality gives a lot of credit to people who are gifted rather than promoting winners or fighters. That is one of the reasons why French tennis is full of talented but non-winner players.
The third is the influence of the national champions. It is always easier for kids to identify themselves with the best player of their country. That is the reason why they are influenced by the type of best player of their country. If the Czech champions hit flat, the kids will be keen on adopting the same style of play.
• The Americans have descended on Europe:
2 hours from Madrid.. Weather radar on plane broke.. Turning around to JFK.. @JackSock is on my flight though #party 🎉🎈🎊
— Madison Keys (@Madison_Keys) April 29, 2015
24 hours after we left kc we made it lol happy to finally be in Madrid 😴😴 pic.twitter.com/v3nzJrfDtq
— Jack Sock (@JackSock) April 29, 2015
[tweet=https://twitter.com/Riske4rewards/status/593823371391070208]

Contributor, SI.com Nguyen is a freelance writer for SI.com, providing full coverage of professional tennis both on and off the court. Her content has become a must-read for fans and insiders to stay up-to-date with a sport that rarely rests. She has appeared on radio and TV talk shows all over the world and is one of the co-hosts of No Challenges Remaining, a weekly podcast available on iTunes. Nguyen graduated from the University of California, Irvine in 1999 and received a law degree from the University of California, Davis in 2002. She lives in the Bay Area.