ベッカーに続きフェデラーを長年支えたセベリン・ルティ氏がルーネのチームに加入

写真は2018年オーストラリアン・オープンでのセベリン・ルティ氏(Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 24: Severin Luthi, coach of Roger Federer of Switzerland looks on in Federer's quarter-final match against Tomas Berdych of the Czech Republic on day 10 of the 2018 Australian Open at Melbourne Park on January 24, 2018 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

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