Mariano's 652 saves is not a safe record. He didn't record his first save until he was 26. His first full season was the next season at 27. Craig Kimbrel is only 28 and already has 237 saves.
Between 2011 and 2014 Kimbrel's lowest save total was 42. Mariano never had a four year run of leading the league in saves, nor did he have a four year run of 40+ saves. Kimbrel's save % is 90.5%, Mariano's was 89.1%. If Kimbrel can have a healthy career than Mariano's record is not safe. Even if it isn't Kimbrel it will just take another career closer with more chances.
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