"Pirates Lock in Mitch Keller with Five-Year, $77 Million Extension"

The Pittsburgh Pirates have signed right-hander Mitch Keller to a five-year contract extension worth $77 million, guaranteeing him four years and $71.5575 million in new money. Keller, a former top prospect, has shown improvement over the past two seasons, particularly after adding a sinker to his pitching arsenal. The deal reflects the team's pursuit of Keller's potential, despite some inconsistent performances in recent years.