Caleb Thielbar Returns to Cubs Seeking Continued Relief Success

39-year-old reliever Caleb Thielbar is back with the Chicago Cubs for the 2026 season. Coming off a 2025 campaign where he posted a 3-4 record with a 2.64 ERA and a 0.88 WHIP, Thielbar is expected to occupy a short/middle relief role. While his spring performance has been inconsistent, he remains a key part of the bullpen depth. He continues to rely on a diverse pitch mix, featuring a signature curveball that he throws at varying speeds to disrupt opposing hitters.