As we approach Week 4 of the 2025 MLB fantasy season, three starting pitchers have emerged as potential waiver wire targets due to their surprising performances. Griffin Canning of the New York Mets showcased significant improvement in his last start against the Cardinals, striking out eight over six innings. Canning has increased his slider usage, achieving a remarkable whiff rate, indicating he could be a valuable addition for fantasy players.

Landen Roupp of the San Francisco Giants also delivered an impressive outing against the Angels, recording nine strikeouts and displaying a dominant curveball that has shown a high strikeout potential. His performance suggests he could be a high-upside option for deeper leagues. Lastly, Luis Ortiz of the Cleveland Guardians is making headlines with his recent strikeout rate. Although his past struggles raise questions about sustainability, his recent performance against the Pirates could indicate he's turning a corner.