The Diamondbacks had climbed to .500 over the weekend only to be swept by the first-place Astros, signifying that the Diamondbacks are indeed going to be sellers before the trade deadline. That became clear yesterday when they traded Josh Naylor to the Mariners for a couple of minor league prospects. But Arizona isn't giving up on the season yet, and they've got their best pitcher of late, Ryne Nelson, on the mound, who beat the Pirates 5-0 in May and has won six out of his last seven starts. Arizona hasn't been able to rely on Zac Gallen or Merrill Kelly this season, but have with Ryne Nelson. The Pirates have won 10 of their last 13 home games. Diamondbacks to win.