As we enter Week 5 of the 2025 MLB season, it's time for fantasy baseball managers to reassess their rosters and consider potential waiver wire additions to gain a competitive edge. Notably, pitchers available in less than 50% of leagues present high upside options for points leagues.

Andrew Abbott of the Cincinnati Reds, rostered in 49% of leagues, has been impressive since returning from a shoulder injury, boasting a 1.64 ERA over 10 innings pitched. His pitch arsenal, particularly his changeup, shows promise. Next up is a matchup against the St. Louis Cardinals, making him a solid target for a waiver pickup.

Mitchell Parker from the Washington Nationals has a remarkable 1.39 ERA despite advanced stats suggesting regression. With the potential for a good trade value, he is another essential addition, especially with a forthcoming start against the Cincinnati Reds. David Peterson of the New York Mets has demonstrated great skills and an impressive ground ball rate, making him a valuable fantasy asset, especially against the Arizona Diamondbacks.

Lastly, Landen Roupp from the San Francisco Giants is on the radar as he possesses advanced stats indicating upside alongside his current roster percentage of 32%. Overall, these pitchers represent strategic opportunities for fantasy managers looking to improve their starting rotations.