Has allowed runs in 4 of his last 9 outings — the dominant April form has slipped. Still the Cardinals' primary save option but the leash is shortening. Hold for now; monitor the next 3-4 appearances closely.

4th blown save of the year. Closer Monkey: 'trending toward second half.' Hold for now — the Cardinals haven't named an alternative — but the slider whiff rate is down and George Soriano is the speculative next-up if O'Brien continues to slip.

13 saves, 5-of-6 conversions in May. The Cardinals are winning enough close games to drive volume. Top-15 RP rest of season — claim if somehow on your wire.

11 saves, clean ninth Friday with a strikeout. The Cardinals' rotation is keeping games close; O'Brien's getting plenty of work. Top-15 RP rest of season.

JoJo Romero also blew it Sunday (go-ahead pinch-hit HR). The Cardinals' 9th inning remains a total mess with O'Brien and Romero both failing in save situations. Avoid unless desperate.

Second blown save on Saturday — surrendered 4 hits, 2 ER with a pathetic 7.7% SwStr%. JoJo Romero also lost Sunday (go-ahead pinch-hit HR). The Cardinals' 9th inning is a mess. Avoid unless desperate for saves.