In September 2014, Yann Marti was called as fifth player and sparring partner for the Davis Cup semifinal Switzerland-Italy in Geneva together with Roger Federer, Stan Wawrinka, Marco Chiudinelli, and Michael Lammer.

Marti came close to a nomination for the Davis Cup Final 2014 against France, when Federer was uncertain due to a back injury.

He said to the media that the fact that he was not picked for the singles was "the biggest disappointment of his career" and that it was better to go home now as he must play some ITF Future tournaments and as he would anyway not be of any help for the team at this stage.

However, the Swiss Federation released a press statement according to which Marti was excluded from the team by the captain due to his bad behaviour after the draw.

Switzerland lost the tie 3-2 and had to play the last decisive rubber with Adrien Bossel, a player ranked lower than Marti.