Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Stan Wawrinka has revealed how he was a bag of nerves before his French Open victory over Novak Djokovic and needed a pep talk from coach Magnus Norman to believe he could win. Wawrinka defied the odds to beat Djokovic in four sets at Roland Garros and claim a second grand slam success to add to the Australian Open and Davis Cup he won last year. Djokovic was hot favourite to win a maiden title in Paris and complete a career grand slam but the world number one was stunned by a blistering Wawrinka display. The Swiss had only beaten Djokovic once in 17 meetings when he took to the court, and the result could have been very different had he not overcome a bout of stage fright moments before the match began.Stan Wawrinka has praised coach Magnus Norman's pre-French Open final pep talk after admitting to being 'really nervous'Wawrinka beat hot favourite Novak Djokovic to win his maiden title in ParisHe won the Roland Garros final in four sets: 4-6, 6-4, 6-3, 6-4The Swiss now has as many grand slam trophies as Andy Murray 
 Question:_ has pedigree in coaching players to success in Paris, having previously led Robin Soderling to the French Open final in 2009 and 2010, while also helping him become the first player in 31 matches to beat Rafael Nadal at Roland Garros.

Magnus Norman