The Rockies saw their four-game win streak end on Friday night at the hands of the road-warrior Oakland A’s in a 9-5 loss, but at least one player had a night to remember.

Infielder Alan Trejo blasted his first Major League home run off A’s righty Burch Smith in the seventh inning, a 433-foot shot into the left-center field stands.

But even as he started to round the bases, he didn't know if he'd gotten all of it.

"I wasn't too sure," he said. "I hit it hard, but I've never hit it to that part of the park here until today."

Manager Bud Black noted postgame that organization has had high hopes for Trejo since he reported to the alternate training site last summer.

"We really liked how he played ... we saw a jump in strength, he was impressive on defense in practice." Black said. "Fast-forward to Spring Training, it was more of the same. We saw the increased bat speed, the increased strength, I thought he was moving great, he was in condition. He played really well, we thought.

"He plays hard, with energy. That was a good swing. He's doing everything he can to impact the team and prove that he can play in the big leagues. It's really good to see that type of player do the things he's capable of doing."

The Rockies were able to retrieve the home run ball for Trejo, who was asked what he planned on doing with it.

"I think I'm going to give it to my dad."

Trejo's moment was a bright spot on an otherwise tough night for the Rockies overall, as starter Jon Gray left the game in the third inning with what Black characterized postgame as right elbow soreness. The unexpected exit followed a shaky start. Gray allowed five runs on four hits -- two of them homers -- and two walks, getting only seven outs before departing with the trainer.