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8/11/2013 4:15 P.M. ET

Young infielders making rookie defensive mistakes

SEATTLE -- Seattle's young infield was responsible for much of the team's success when the Mariners went 15-10 in July. Rookies Brad Miller at shortstop and Nick Franklin at second base combined to significantly increase Seattle's offensive production as the first and second hitters in the lineup, respectively. Third baseman Kyle Seager and first baseman Justin Smoak provided power behind the rookies' speed.

But that youthful exuberance has come with a price of late, as the infield has been responsible for an inordinate number of fielding mistakes. Over the past 11 games, Seattle has committed 12 errors. The rookies have also tried to do too much at times, throwing to the wrong base and costing Seattle runs, even if an error wasn't recorded.

"The veterans know right away that they've made a mistake and most of the time they don't make the mistakes," acting manager Robby Thompson said. "In the case of the guys up the middle, they're learning on the job. They're learning and getting topped off at the big league level. It's a different ballgame playing up here every day than it is in [Triple-A] Tacoma or Double-A [Jackson]."

Out for year, Pryor aims for Spring Training return

SEATTLE -- Right-handed reliever Stephen Pryor is back with the Mariners and wearing a sling after undergoing surgery on his torn right triceps. The club has been without Pryor since he was placed on the disabled list in mid-April.

The 23-year old fireballer rehabbed by pitching for Triple-A Tacoma, but experienced soreness in his triceps last week. After undergoing an MRI, it was decided that the reliever would have to undergo season-ending surgery.

"I guess the first time, it didn't scar-tissue down the way they thought it would, so they went back in and put it where it's supposed to go. It'll take some time and then hopefully I'm back to where I was," Pryor said.

Prior to his injury, Pryor made seven scoreless appearances for the Mariners. Since his debut in 2012, he has a 2.97 ERA in 30 1/3 innings over 33 appearances. He'll be in the sling for six weeks before starting physical therapy, and hopes to be pitching by Spring Training.

Worth noting

Hisashi Iwakuma pitched six scoreless innings before getting shelled in the seventh of Saturday night's 10-0 loss to the Brewers. Iwakuma tried to make a play on a bunt single and appeared to tweak his back in the process. After that play, Milwaukee teed off on the All-Star -- Iwakuma allowed six runs on six hits before recording an out in the frame -- who couldn't keep his pitches low in the zone.

After the game, Iwakuma told reporters that he was also experiencing flu-like symptoms before the game.

Jacob Thorpe is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.