PHOENIX (AP) — Jake Lamb knew Adam Ottavino throws so hard that if he connected at all, the ball could go a long way.
And it did.
Lamb drove Ottavino's 97-mph fastball over the porch in left-center for a grand slam, and the Arizona Diamondbacks rallied to beat the Colorado Rockies 5-2 on Friday night.
The rookie, called up from Triple-A Reno on Aug. 7, connected with two out in the eighth inning. It was his second career homer.
"That was really cool," Lamb said. "I missed a lot of fastballs early on in the game. It was more than frustrating. But I went up there, the guy was throwing hard, and I just wanted to have a short swing. When he's throwing that hard and you hit barrel on it, it can go far."
Rex Brothers (4-6) walked his only three batters and threw a wild pitch before Ottavino came in. But Ottavino looked set to escape the threat before Lamb went deep.
He got Mark Trumbo to bounce into a fielder's choice that could have been a double play if the reliever was able to get the ball out of his glove cleanly. He also struck out Miguel Montero before Lamb came to the plate.
"Being conservative I just tried to throw a strike thinking I could overpower him," Ottavino said. "He barreled it. Bottom line, he did a great job."
Brad Ziegler (5-2) gave up a run in his one inning but got the victory. Addison Reed fanned two in a perfect ninth for his 31st save of the season and No. 100 for his career.
Reed said it was "just a number." He was more interested in talking about Lamb's slam.
"If that would have been save number two I would have been happy," Reed said. "Any time we get a go-ahead grand slam by a rookie that just came up, it's awesome. It has to be awesome for him too."
Colorado grabbed a 2-1 lead on Charlie Blackmon's sacrifice fly in the eighth inning of the opener of a weekend series between the teams with the worst records in the National League.
Both starting pitchers were excellent.