The Rockies are playing a lot of young, untested players, have trouble hitting away from Coors Field and are facing a lefty. That's all bad for their offense.

The Giants also are facing a southpaw. They are well below average against lefties ranking second-from-the bottom in slugging percentage and 28th in OPS. That's good news for Colorado's lefty starter Ty Blach, a former Giant. He's pitched well in three of his last five starts.

San Francisco has scored three or fewer runs in five of its last six games. The Giants have scored two or fewer runs in four of those games.

Good looking rookie southpaw Kyle Harrison, one of the team's top prospects, gets the call for the Giants. The Rockies have never faced him. Harrison held the Reds to no runs on three hits and had 11 strikeouts in 6 1/3 innings during his last home start.

The Rockies are batting .229 in road games, the fourth-lowest away batting average. They also have the second-lowest OPS versus lefties and rank fourth-from-the-bottom in slugging percentage versus southpaws.