The D-backs on Friday finished the deal.
On a self-described "grind day," Shields suffered his first loss of the season after the D-backs made him throw nearly 30 pitches in the first inning and scored three runs with two outs in the third in an eventual 4-2 loss for San Diego to open a three-game series at Chase Field.
Shields' 7-0 start to the season in 14 starts was the best of his career, but he said he knew as he warmed up in the bullpen Friday it was going to take a workhorse effort to get to 8-0.