Pittsburgh almost lost Grilli this season to a number of teams in free agency, including the Toronto Blue Jays, who were supposedly hard-charging to sign him.
The 36-year-old Michigan native was solid last year despite a 1-6 record, racking up a 2.91 ERA and 1.14 WHIP with an excellent strikeout rate. Over the course of his career with the Florida Marlins, Chicago White Sox, Detroit Tigers, Colorado Rockies, Texas Rangers and Pirates, Grilli has a 4.34 ERA.
The last two years have been among Grilli's best, as he posted ERAs under 3.00 for just the second and third times in his career.
Bringing back Grilli seems to be critical for Pittsburgh as he'll anchor the back end of the bullpen as the Pirates try to contend in the National League Central.