Robertson allowed one hit and struck out the side while notching his 21st save in Thursday's 6-5 win over the Twins.

EDGE Analysis

By slamming the door Thursday, Robertson moved into second in the AL for saves -- behind Orioles closer Zach Britton (23). The only knock on the 31-year-old could be his 1.40 WHIP, much of which stems from his unusually high walk rate of 5.23, which comes on the heels of a career-best 1.85 BB/9 in 2015.

Robertson pitched a perfect ninth inning to earn his 20th save of the year Sunday against the Blue Jays.

EDGE Analysis

Robertson was protecting a three-run lead, and he only needed 10 pitches to close the door on the Blue Jays. He now has successfully converted his last 10 save opportunities, and he has a 3.31 ERA to go along with a 1.41 WHIP.

Robertson allowed no runs on two hits and a walk over one inning to earn his 19th save of the year Friday against the Blue Jays.

EDGE Analysis

Robertson was protecting a one-run lead, and loaded the bases with one out before getting a strikeout and a pop out to secure the victory. Despite converting all six of his save opportunities this month, he's walked 10 batters in 11.1 innings to raise his WHIP to 1.45 on the year.

Robertson recorded the final four outs and allowed just one walk to pick up his 18th save Tuesday against the Red Sox.

EDGE Analysis

This marks just Robertson's second save of the season in which he has had to record more than three outs. Don't expect this to become the norm for Robertson, who typically only goes multiple innings in an extra-innings situation. He now has a 3.64 ERA, but note that half of his 12 earned runs came in one appearance May 28 against Kansas City.

Robertson allowed one hit while striking out two to work a scoreless tenth inning in Boston for his 17th save.

EDGE Analysis

Robetson rebounded nicely from his first loss of the season last time out. The former Yankee is now in sole possession of fifth place in the American League with 17 saves.

Robertson allowed a run on two hits and two walks in two-thirds of an inning against the Indians on Sunday to take his first loss of the season.

EDGE Analysis

The White Sox did not hand Robertson a save situation in this game, but the pressure was still on in an extra-inning contest. The pair of walks pushed his season total to 14, or one more than he allowed all of last season. Robertson's hold on the Sox's closer gig is secure, but that role is slightly less lucrative during their current losing streak, and his peripherals on the whole have been less impressive than in seasons past.

Robertson gave up two hits in the ninth inning Thursday against Washington, but struck out one and was able to come away with his 14th save.

EDGE Analysis

After coming in for a non-save situation and giving up three runs Wednesday against these same Nats, Robertson got into a jam while trying to preserve a two-run lead in this one, putting runners on first and third before he got Daniel Murphy to fly out and end it. That implosion has conspired with his May 28 disaster against the Royals -- also in a non-save situation -- to make his ratios ugly (4.18 ERA, 1.27 WHIP), but Robertson's one of the game's better closers and should get things back in order soon.

Robertson earned his 13th save with a scoreless inning Tuesday against the Mets, including a pair of strikeouts.

EDGE Analysis

Robertson bounced back from allowing six earned runs in a non-save situation in Saturday's devastating loss to the Royals. He's now 13-for-15 in save opportunities, but his ERA will be carrying the brunt of Saturday's blowup for some time. His ERA jumped from 0.96 to 3.72 after that outing, and it still sits at an underwhelming 3.54. But more relevant going forward, Robertson has allowed runs in just three of his 19 appearances this season, and he remains nasty, with 25 strikeouts in 20.1 innings.

Robertson allowed six runs on four hits and two walks against the Royals on Saturday.

EDGE Analysis

This should have just been a "get work" outing for Robertson, as he entered the game in the ninth inning despite his team already up a half-dozen runs. That lead disappeared quickly under Robertson, who has just four saves in May after accumulating eight in April. The disparity has more to do with the White Sox's failure to take many leads this month, and Robertson should still be counted on to pick up good save and strikeout numbers if his usage picks up.

Robertson picked up his 12th save in the first game of Monday's double-header against the Indians. He struck out two and walked one.

EDGE Analysis

The closer lowered his ERA to 0.96, but he had to labor a bit in order to do so. Clinging to a one-run lead, Robertson needed 22 pitches to leave the tying run stranded in scoring position.