PHOENIX -- The D-backs were unable to sign high school shortstop Matt McLain, their first pick (25th overall) in the 2018 MLB Draft before Friday afternoon's signing deadline.
McLain, who graduated from Beckman (Calif.) High School, will instead attend UCLA.
"We knew that on Draft day," D-backs general manager Mike Hazen said of McLain's decision to attend college. "We really liked him. He was very high on our board. We felt like it was the right pick to make at the time. I'm not going to speak for him, but what was communicated to us was that the right decision for him was to go to UCLA, and we respect that."
The D-backs offered the full slot value of $2,636,400 to McLain, a source said, but that was not enough to get the deal done.
"I'm not going to get into exactly the financial part, but I will say we felt like it was a competitive offer," Hazen said. "I believe that this decision was made not as much on financial grounds, as it was that he felt like the right thing to do was to go to school."
As compensation, the D-backs will receive the No. 26 overall pick in next year's Draft, in addition to their own selection.
Hedging their bets against McLain making just such a decision, the D-backs drafted high school shortstop Blaze Alexander in the 11th round and signed him for $500,000, which was well above slot value.
Delgado back
The D-backs activated reliever Randall Delgado from the 60-day disabled list Friday and designated reliever Noel Salas for assignment in order to make room on the roster.

Delgado missed the second half of last season with elbow issues, and then suffered an oblique injury this spring.
Dyson update
Outfielder Jarrod Dyson, who was placed on the 10-day disabled list Thursday after suffering a lower core injury in Wednesday night's game, continued to receive treatment Friday.
D-backs manager Torey Lovullo said Dyson had yet to sit down with a specialist to get the full extent of his injury.