Week 12 Fantasy Baseball Waiver Wire: Roki Sasaki's Breakout

In Week 12 of Fantasy Baseball, Roki Sasaki’s recent performance became the focal point for waiver recommendations. After struggling early in the season, where he recorded a 6.35 ERA by the end of April, many had dismissed him from their fantasy teams. However, he made significant adjustments, notably changing the shape of his slider and working on a more effective splitter. This evolution coincided with a noticeable increase in his pitch velocity.

Sasaki’s past four starts showcased a remarkable turnaround, particularly highlighted by his outing against the Angels on June 5, 2026, where he struck out 10 batters over seven shutout innings—marking a career-high in strikeouts for a single game. Since May, his statistics reflected a 2.55 ERA with 38 strikeouts and only eight walks over 35.1 innings. This resurgence underlines Sasaki's potential to finally live up to the high expectations set before his major league debut.

While skepticism remains due to the limited sample size, particularly concerning the sustainability of his increased velocity, the upside is compelling enough to warrant serious consideration. He is still rostered in about 25% of CBS Fantasy leagues, a number likely to decline as more players recognize his breakout potential.

Besides Sasaki, several other players emerge as solid waiver wire targets heading into Week 12.

1. Francisco Alvarez, Mets (35%)
Alvarez is on a rehab assignment and could return as early as June 8, 2026. After undergoing surgery for a torn meniscus, his swift recovery bodes well, especially considering he was exhibiting signs of improvement prior to his injury, including lower strikeout rates and higher expected wOBA.

2. Endy Rodriguez, Pirates (7%)
Rodriguez, despite a slow start with a .225 batting average, boasts a commendable .404 on-base percentage, bolstered by twelve walks in just sixteen games. His progression merits attention in deeper leagues, as he aims to capitalize on the Pirates' lack of consistent production at catcher.

As the fantasy season moves forward, monitoring Sasaki’s performance along with these additional emerging talents could significantly influence roster decisions.