SCOTTSDALE, Ariz. — David Dahl and Ryan McMahon continue to put pressure on manager Bud Black and general manager Jeff Bridich as next week’s 25-man roster decision nears. “Hey, that’s a good thing,” Black has said more than once in recent days. Dahl, likely to begin the season at Triple-A Albuquerque to insure plenty of at-bats, continues to scorch Cactus League pitching.