Severin Lüthi

Sporadically, he has also shown up in the coaching camp of fellow Swiss tennis star Stan Wawrinka.

He gave up tennis at the age of 20 and served a commercial apprenticeship with his father's company.

Instead, he got involved in sports, first soccer, then as assistant coach of the Swiss Davis Cup team in 2002 when Peter Carter was killed in an automobile accident in South Africa.

He coached the team that won the Davis Cup for Switzerland in November 2014, as Roger Federer beat Richard Gasquet.

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