Shields came to terms Monday with the Padres on a four-year contract worth around $75 million, ESPN.com reports. After a long wait, the top pitcher on the free-agent market will ink a deal with the Padres, capping an active offseason for the squad. Shields immediately slots in as the Padres' staff ace, and should compensate for an expected dropoff in skill by pitching in the favorable confines of Petco Park. Perhaps more importantly, Shields, who has covered an MLB-high 932.2 innings over the last four seasons, adds durability to a Padres pitching corps that has been ravaged by the injury bug in recent years.