Montgomery, 31, signed a one-year deal last March worth $25 million, but didn't live up to the high price tag, finishing with a 8-7 with a 6.23 ERA over 117 innings. The poor performance drew the ire of D-backs owner Ken Kendrick following the season.
Montgomery's option would have increased to $25 million if he had made 23 starts — he finished with 21. The option brings the total amount of his deal to $47.5 million.
Suárez was a key piece for the Diamondbacks and had one of the best seasons of his career, batting .256 with 30 homers and 101 RBIs. He'll make $15 million next season as part of a deal he signed with the Reds in 2018, raising the contract's worth to to $79 million over eight years.
Kelly, 36, battled a shoulder injury for much of last season but was good when he pitched, finishing 5-1 with a 4.03 ERA. He'll make $7 million next season, making his contract worth $24 million over three seasons.
The left-handed hitting Pederson hit well against right-handed pitching last season and finished with 23 homers, batting in the middle of the D-backs order. Counting the buyout, he made $12.5 million during his year in Arizona.
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