Grand Canyon swept its seventh WAC doubleheader of the season Friday night with a run-rule opening win and a walk-off nightcap victory against Southern at GCU Softball Stadium, where its seventh straight WAC series victory and sixth consecutive win maintained its commanding four-game conference lead. Lopez ends 1st win in 6th inning The Lopes scored in five of six innings against the Thunderbirds to ultimately shut out Southern Utah 8-0 with a sixth-inning RBI single by graduate designated player Ramsay Lopez . Junior WAC Co-Pitcher of the Year Meghan Golden earned her 10th win in the circle this season, throwing…