Seattle Mariners starting pitcher James Paxton (back) left his start Thursday early with lower back stiffness and tossed just 17 pitches over two-thirds of an inning against the Angels. That's obviously not good news for the Canadian left-hander, but at least the All-Star break next week will give him extra time to rest if it's a serious injury. Paxton was having a fine season with an 8-3 record, 3.49 ERA, 1.07 [...]