Few, if any, players in the 2025 international class boasted a hit/power combination that could rival Kevin Alvarez. The No. 7 prospect from that group excelled during his pro debut in the Dominican Summer League last year, impressing so extensively that the Astros bypassed the Florida Complex League and sent him to Single-A Fayetteville in April to get his stateside journey underway.
After a slow start out of the gate by his standards, the Astros’ No. 1 prospect has begun to find his level. The latest milestone moment came Thursday night when Alvarez slugged his first professional grand slam in an 11-5 win for Fayetteville over Hill City at City Stadium.
Before the home run fireworks, Alvarez had already turned in an impressive at-bat: Facing right-hander Erigaldi Perez (Guardians) in the first, the left-handed-hitting outfielder fell behind 0-2 on a pair of called strikes. But he managed to lay off four consecutive pitches outside the zone, drawing a walk.
MLB’s No. 70 prospect put that sticktoitiveness back on display in the fifth against righty Angel Perez, fouling off three pitches before working the count full again. He got a heater on the inner third and jumped all over it, towering his seventh homer of the year just inside the right-field foul pole.
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At 18 years and 171 days old, Alvarez is the youngest player to hit a grand slam above Rookie ball in 2026. The most recent player to achieve the feat before him under the same age parameters? MLB’s No. 1 prospect Jesús Made, who did so last April 26 for Single-A Carolina.
"He's full of energy. I call him 'The Kid' all the time because he is still a child," said Fayetteville hitting coach Steve Serratore of Alvarez in late June. "In terms of his competitiveness and his confidence to not shy away from moments, but to relish in it, that's really dang special."
Much like Made, life in the Carolina League has meant that all of Alvarez’s plate appearances have come against older pitchers. He has battled through the ebbs and flows that are to be expected of a teenager facing elevated competition but he entered the night running a 25 percent line-drive rate that ranked him 11th among all qualified Astros prospects throughout the system. He hasn’t walked a ton (just 7 percent) but he’s managed to keep his strikeouts (18.4 percent) in check.
Alvarez closed June with back-to-back two-hit games, then did so again to open July on Wednesday. Over his past eight games, the Cuba native has compiled 21 total bases and a .355/.459/.677 slash line with 10 RBIs.
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Alvarez has seen the majority of his time defensively in center field but has also made nine starts apiece in left and right field as the Astros attempt to get looks at the premium spot for many of their talented outfielders with the Woodpeckers, which includes Anthony Huezo (HOU No. 17) and 2025 draftee Josh Wakefield.
The Astros are the only organization that regularly features both of its top prospects in the same lineup at Single-A. Alvarez has teamed up with 2025 first-rounder Xavier Neyens (HOU No. 2/MLB No. 89) to make for a fearsome duo for Fayetteville. They’ll both be taking their talents to the national stage on July 12 as they represent the American League during the 27th annual All-Star Futures Game.