Nick Piecoro of the Arizona Republic reports (via Twitter) that the Diamondbacks have signed right-hander Rodrigo Lopez to a minor-league deal that includes an invitation to spring training. Lopez pitched in seven games (five of them starts) for Philadelphia last season, posting a 5.70 ERA. He underwent Tommy John surgery in 2007 that caused him to miss nearly all of 2008, save for three late-season minor league starts.