Looking into the future is what Opening Day is all about. This could be the moment Diamondbacks fans knew it was real.

Disappointment defined Zac Gallen's Opening Day start, as the Diamondbacks pitcher gave up four earned runs to the Cubs in a 10-6 loss.

Gallen (0-1) took the loss Thursday against the Cubs after giving up four runs on four hits and four walks over four innings. He struck out four. Gallen finished spring training with a 2.89 ERA and 10:5 K:BB in four Cactus League outings,