Week 12 of the fantasy baseball season brings several intriguing waiver wire options for pitchers. Shane Baz of the Tampa Bay Rays, currently owned in 43% of leagues, shows considerable upside with his impressive Stuff+ rating, despite a rocky stretch in June. His blend of strikeout potential and ground ball ability makes him worth a look for fantasy managers seeking help in the second half of the season.

San Francisco Giants' Hayden Birdsong, at 41% rostered, has emerged as a solid starter after a strong relief stint. With a favorable home environment and limited competition for his spot, he offers a promising outlook for the remainder of the year. Shane Smith from the Chicago White Sox, just 34% owned, has also been a consistent performer, maintaining a low ERA with good underlying stats. Lastly, Landen Roupp, also with the Giants, has made significant improvements, showcasing a strong curveball and an expanding pitch arsenal, making him a compelling option if you're searching for a reliable arm.