Zac Gallen has been horrible lately but one of his best starts came at home against these Giants. On May 18, he tossed six innings and allowed two runs in a 12-2 win over San Francisco. That's part of Arizona's 8-0 record vs. the Giants this season. While it's hard to back Gallen, I have a lot more faith in the Diamondbacks lineup against Trevor McDonald. The rookie posted a 5.73 ERA in June and San Fran has dropped six of his last seven starts.