SAN FRANCISCO -- Left-handed-hitting Brandon Crawford got the start at shortstop against Arizona Diamondbacks southpaw Patrick Corbin on Monday, with red-hot backup Joaquin Arias getting a day off to nurse a tight calf muscle. Arias, who was out of the lineup Thursday after getting hit by a pitch on his left wrist, began to feel tightness in his calf in Sunday's game against the Cubs. Arias is coming off an August in which he led the Majors with a .417 average while driving in 15 runs and hitting three homers. "His wrist is fine, but his calf is a little tight, so we're being a little cautious with him," manager Bruce Bochy said. "He felt it yesterday in the game, but he stayed in until I made the double-switch. It's a little tight today, so he's getting a break today. He is available to pinch-hit, but we want to get him some rest out there today."