Kenley Jansen broke the all-time strikeout rate record

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I wrote last week about how Kenley Jansen had the second-highest strikeout rate in baseball history, but the Dodgers rookie was so dominant down the stretch that he vaulted into the top spot.

Jansen ended up striking out 34 of the final 56 batters he faced this season–which is absolutely ridiculous–and finished the year as the first pitcher in baseball history with more than 16.0 strikeouts per nine innings.

Here’s the new all-time leaderboard (among pitchers with at least 40 innings):

                  YEAR     SO/9
KENLEY JANSEN     2011     16.1
Carlos Marmol     2010     16.0
Eric Gagne        2003     15.0
Billy Wagner      1999     15.0
Brad Lidge        2004     14.9

Jensen racked up 96 strikeouts in 53.2 innings while posting a 2.85 ERA and .159 opponents’ batting average. Not bad for a 23-year-old rookie who was a light-hitting catcher in the minors as recently as two seasons ago.

Padres, Mariners join list of teams to extend netting

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The Reds announced earlier that they plan to extend the protective netting at Great American Ball Park in time for Opening Day next season. You can add the Padres and Mariners to what will surely be a growing list.

A young fan was struck in the face by a foul ball at Yankee Stadium on Wednesday, which gave new life to the netting debate. Some fans and media types think Major League Baseball is not doing enough to protect fans. While Major League Baseball has issued guidelines for protective netting, it is ultimately up to the teams to decide just how much netting to use.

Zach Britton receives stem cell injection, likely done for the season

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Orioles closer Zach Britton is likely done for the remainder of the 2017 season after receiving a stem cell injection in his left knee, Peter Schmuck and Jon Meoli of the Baltimore Sun report. Britton has been battling knee problems for most of the season.

The Orioles are still technically in the AL Wild Card race, entering play Thursday 5.5 games behind the Twins for the second Wild Card slot. With only nine games remaining, however, the 73-80 Orioles are likely being realistic about their chances and not taking any unnecessary risks with Britton.

Britton, 29, put up a 2.89 ERA with 15 saves and a 29/18 K/BB ratio in 37 1/3 innings this season. He will be eligible for arbitration for the fourth and final time this offseason.