Stunning the Tour de France on its first rest day, doctors diagnosed a tumour in the left testicle of two-time Giro d’Italia winner Ivan Basso on Monday, forcing him out of the showcase race. His former rival Lance Armstrong, who survived testicular cancer that spread to his lungs and brain, immediately tweeted his support. At age 37, Basso wasn’t a contender to win the race, but his experience and pedigree – Basso finished second at the 2005 Tour and third in 2004 – meant his withdrawal was keenly felt by his team leader Alberto Contador. The 2007 and 2009 champion must now tackle the most arduous two weeks of the Tour, with decisive climbs in the Pyrenees and Alps, without the assistance and moral support of his veteran teammate and training partner. A visibly shaken Basso appeared with Contador at a news conference and announced doctors diagnosed a tumour in his left testicle that had been painful since he crashed on Stage 5. But his Tinkoff-Saxo team said more tests are needed to be certain the tumour is cancerous.