As the 2025 All-Star break approaches, fantasy baseball managers should focus on strategic roster improvements. With many players still under 40% ownership across Yahoo! leagues, now is the time to consider impactful waiver wire additions. Key players include Colt Keith of the Detroit Tigers, who has surged with a .310 average and six home runs in recent weeks, and Romy Gonzalez from the Boston Red Sox, taking advantage of an increased role with impressive stats of .333 average and five homers. Otto Lopez of the Miami Marlins, Mickey Moniak of the Colorado Rockies, and pitchers like Emmet Sheehan and Slade Cecconi are also highlighted as valuable pickups for the second half of the season.