Castro (7-3, 1.83 ERA) has been quite the left-handed complement at the top of the Power's rotation, using pinpoint location with his 90-mph fastball and pitching to contact, which adds quite the contrast to teammate Tyler Glasnow's power right arm.
Both will appear in the South Atlantic League All-Star Game on June 18 in Lakewood, N.J., and both have been instrumental in the Power's successful first half.
Glasnow (3-1, 3.21) will pitch in the series finale today at 2:05 p.m.
Outfielder Walker Gourley will join Castro and Glasnow in the all-star game and had two of the Power's seven hits on Saturday and scored the game's only run.
After reaching on a single, Gourley showed great hustle in going from first to third base on a sacrifice bunt, barely beating out the tag.
After Josh Bell hit an infield single and Stetson Allie struck out, third baseman Eric Wood placed a line drive inches inside the right field line for a double and an RBI.
Gourley upped his season batting average to .331, has a six-game hit streak, and has now reached base safely in 19 consecutive contests.
Ryan Hafner pitched a perfect eighth inning and Kyle Haynes tossed a perfect ninth for his sixth save of the season. In total, Power pitching faced two batters over the minimum.
Bell also had a pair of hits for West Virginia and Wood's double was the only extra-base hit of the game.
Hagerstown will counter Glasnow with righty Ivan Pineyro (4-3, 3.33) in today's rubber match.
West Virginia will begin a seven-game roadtrip with three at Delmarva beginning at 7:05 p.m. on Monday.
Reach Ryan Pritt at 304-348-7948 or ryan.pr...@wvgazette.com.