The Cubs will turn to Tyler Chatwood in the series opener on Friday. The right-hander has been hit hard in his past two outings, giving up seven earned runs in each start. Chatwood is looking to go six innings for the first time since April 29. He’ll hope do so at Petco Park, where he’s 4-1 lifetime with a 2.84 ERA. The Padres will counter with a former Cub, left-hander Clayton Richard. First pitch is scheduled for 9:10 p.m. CT.