Grimm was optioned to Triple-A Iowa on Saturday, Bruce Levine of 670 The Score reports.

EDGE Analysis

Grimm hasn't allowed a run in his last 10 appearances, but the Cubs needed to free up a roster spot for Brian Matusz, who will be added to the 25-man squad to start Sunday's matchup with the Mariners. The right-handed Grimm struggled through May and June but has notched seven strikeouts while allowing just two hits in 6.1 July innings.

Grimm struck out the side in his final appearance of the first half Saturday, and went into the All-Star break on a streak of five consecutive scoreless appearances.

EDGE Analysis

The follow-up to Grimm's stellar 2015 has been disappointing, as he has a 5.34 ERA and 1.45 WHIP in 40 appearances, but Saturday marked his first game with three strikeouts since Apr. 28, so perhaps he's ready to right the ship.

Grimm struck out two in a scoreless ninth inning against Arizona on Friday.

EDGE Analysis

Grimm has made 23 appearances this season, but only one was for more than one inning. He has a 23:6 K:BB and 3.54 ERA in 20.1 innings in 2016.

Grimm may get an opportunity to save Sunday's game with Hector Rondon having pitched in each of the last days.

EDGE Analysis

Pedro Strop pitched Saturday as well, but he might get the shot before Grimm, though with Jake Arrieta starting, it's possible the Cubs won't need any relievers at all. That said, Grimm, Strop, and Rondon have formed a formidable bullpen. Grimm's 13:0 K:BB in fits right in - the three combine for a 50:4 K:BB in 34 innings.

Grimm earned his first hold of the season Friday with a scoreless seventh inning against Arizona. He struck out two.

EDGE Analysis

While Neil Ramirez, Clayton Richard and Adam Warren haven't pitched yet, Grimm has gotten into two games already and seems to have a key role in the Cubs pen right now. He'll likely pitch a lot of seventh innings this year.

Grimm struck out the side in his one inning Thursday against the Mets.

EDGE Analysis

Grimm has struggled this spring - six walks and six hits allowed have contributed to a 8.22 ERA, but he's getting the strikeouts, with seven in his last three appearances and 10 overall in 7.2 innings. He'll be a significant contributor to the Cubs' bullpen this season.

Grimm struggled Saturday, giving up four runs in just two-thirds of an inning. Two of the runs came on a two-run homer by Michael Brantley that knocked him out of the game.

EDGE Analysis

It didn't help that he walked the first two batters, but even the outs Grimm got came on line drives. It was a night to forget for Grimm, who has not pitched well this spring. In four appearances covering 3.2 innings, he's given up four hits and seven runs and has a 3:4 K:BB. He's expected to be a key part of the Cubs' bullpen this season, but he'll need to right the ship soon.

Grimm struck out two in a perfect inning in a split-squad win over the Reds on Friday.

EDGE Analysis

Grimm struggled in his only other appearance this spring, giving up two runs and walking two, so Friday was infinitely better. He's expected to be a key part of the Cubs' bullpen this year, but he's unlikely to ever sniff any saves.

Grimm and the Cubs avoided arbitration Friday, agreeing to a one-year, $1.3 million deal, the Chicago Tribune reports.

EDGE Analysis

Grimm had a mostly successful 2015 campaign, though he faltered down the stretch, allowing 12 runs and 12 walks over his last 15 appearances. Even so, that followed an impressive run of 15 consecutive scoreless appearances, and Grimm concluded the year with a K/9 rate of 12.1, by far a career-best. Grimm figures to return to the Chicago bullpen in a similar, late-inning role in 2016.

Grimm gave up a pair of two-run homers in his brief appearance against the Reds on Monday, falling to 2-4 in the process.

EDGE Analysis

Grimm was spectacular in August - until the month's last day. For the year he has a 2.09 ERA, 1.06 WHIP, and 53:15 K:BB in 38.2 innings.