San Diego Padres right-hander Nick Pivetta was placed on the 15-day injured list on Tuesday with inflammation in his pitching elbow. The move came two days after Pivetta was forced from Sunday’s 7-2 win over Colorado in the fourth inning by stiffness in his pitching elbow. “We're trying to be cautious with Nick and I think the smartest move was to not push him and give him some time on the IL and then figure it out from there,” manager Craig Stammen said before the Padres opened a three-game series against the Seattle Mariners.