Del Potro robbed in Paris on way to London tournament Sat Nov 2, 2013 1:09pm EDT (Reuters) - Argentina's Juan Martin del Potro was robbed of a briefcase as he signed an autograph at Gard du Nord in Paris on Saturday on his way to London for next week's ATP World Tour Finals. I was checking in for the (Eurostar) train and I was asked for an autograph. I turned round to sign it and in those 20 seconds I had (the case) stolen," Del Potro said in a statement. The world number five, who lost his Paris Masters quarter-final to Roger Federer on Friday, kept his passport, money and other personal effects, including a rosary, in the briefcase. "My rosary, blessed by Pope Francis, which I took with me everywhere, that's what mattered to me most," said Del Potro, who met the Argentine-born Pope during the Italian Open in Rome earlier in the year. Reporting by Luis Ampuero in Buenos Aires; Writing by Rex Gowar; Editing by Stephen Wood