From BR Bullpen
Kenley Geronimo Jansen
also listed as Kenley Corrales Jansen
- Bats Both, Throws Right
- Height 6' 6", Weight 220 lb.
 Biographical Information
Kenley Jansen, who was a minor-league position player, converted to pitcher in 2009 and was successful enough that he made his major league debut on July 24, 2010 with the Los Angeles Dodgers. In 2011 he broke the all-time strikeout-per-nine-innings record, finishing with 96 strikeouts in 53.2 innings, for a 16.1 ratio of strikeouts per nine innings (minimum 40 innings).
He is the younger brother of former minor leaguer Ardley Jansen. In his first three minor league seasons, he led the league in a defensive department while his offensive production varied. When his career as a catcher stalled, he became a pitcher.
Kenley Jansen was signed by scouts Camilo Pascual and Rolando Chirino for the Dodgers a couple of months after his 17th birthday. He debuted professionally with the 2005 GCL Dodgers (.304/.339/.441) and Ogden Raptors (2 for 11, BB, 5 K, 2B). He led Gulf Coast League catchers with a 1.000 fielding percentage. In 2006, Jansen hit .248/.362/.308 for the GCL Dodgers. He led GCL backstops in putouts. He only was 4 for 33 with no walks and 8 strikeouts for the North Shore Honu that winter. He batted .240/.346/.311 with 50 strikeouts in 183 AB for Ogden in 2007 and .102/.214/.169 with 16 whiffs in 59 AB for the Great Lakes Loons. His .994 fielding percentage led the Pioneer League's catchers.
He was on the preliminary 42-man roster for the Dutch national team for the 2008 Olympics. Of the five catchers listed, he was the only one who had not played for the national team but also the only one with experience in US minor leagues (Tjerk Smeets and Sidney de Jong had played college baseball in the USA). He did not make the final cut.
In 2008, Jansen hit .227/.298/.397 with 9 home runs and 72 strikeouts in 247 AB for Great Lakes. He threw out 35 of 94 attempted base-thieves. In the 2009 World Baseball Classic, Kenley was 1 for 13 with a walk and six strikeouts while sharing catching duties with de Jong. His lone hit was off Roy Oswalt.
Jansen struggled offensively in 2009 with the Inland Empire 66ers (.202/.268/.303 in 26 G) and Albuquerque Isotopes (5 for 27, BB) while throwing out 38% of attempted base-stealers overall. Moved to the mound, he walked 11 in 11 2/3 IP but struck out 19 for the 66ers, posting a 4.63 ERA and registering no decisions. He was then sent to the Arizona Fall League for further development as a pitcher.
Kenley was added to LA's 40-man roster in November 2009. He was 1-1 with 28 strikeouts in 15 innings for the 2010 66ers then went 4-0 with 8 saves, a 1.67 ERA, 50 strikeouts, 17 walks and only 14 hits in 27 innings for the Chattanooga Lookouts. That earned him a trip to the major leagues, only a year after he became a pitcher.
Jansen pitched a scoreless inning against the New York Mets in his major league debut on July 24, 2010, then earned his first major league save by pitching the 9th inning of a 1-0 Clayton Kershaw victory over the Mets the next day. He recorded two strikeouts in each of his first two major league innings. Kenley enjoyed his first major league at-bat, drawing a walk and scoring a run. Manager Joe Torre observed that Jansen seemed to know what he was doing as a batter and a baserunner, and then recalled that a year ago, Jansen had been a catcher. He finished that first season with a record of 1-0, 0.67 and 4 saves in 25 games, striking out 41 batters in 27 innings.
Kenley spent most of 2011 with the Dodgers, making 51 appearances out of the bullpen with a record of 2-1, 2.85, and 5 saves. His 96 strikeouts in 53 2/3 innings gave him the highest ratio ever for a pitcher throwing 40 or more innings. However, he missed four weeks of the season when he was diagnosed with an irregular heartbeat, and had to take blood thinners to control the condition. He had a recurrence of the condition in spring training in 2012, but not severe enough to place him on the disabled list. He was anointed as the team's closer in late April, replacing Javy Guerra, and did quite well, saving 25 games in 56 appearances while going 5-3 with a 2.54 ERA. He struck out 86 in 56 2/3 innings, an outstanding ratio even if behind the previous season's record pace, and walked only 19. However, on August 29th, he was again sidelined by his recurring heart condition. He came back to pitch in late September, but Brandon League had assumed closer duties in his absence and finished the year in the role. Jansen ended the season with a record of 5-3, 2.35 in 65 games, with 25 saves and 99 strikeouts in 65 innings. On October 23rd, he underwent surgery to correct the heartbeat problem.
Jansen initially decided not to play for the Dutch team in the 2013 World Baseball Classic, having been a catcher for them in the event four years prior. After the Netherlands surprisingly made it to the final four, though, he agreed to be an injury substitution for Jonatan Isenia. He did not pitch in the only game he was on the roster, a 4-1 semifinal loss to the eventual champion Dominican national team; the Orange used Diegomar Markwell, Tom Stuifbergen, Leon Boyd and Loek van Mil instead.
He was again the Dodgers' closer in 2013 and picked up 28 saves while being nearly unhittable. In 75 games and 76 2/3 innings, he gave up 48 hits and 18 walks while striking out a whopping 111 batters. His record was 4-3, with an ERA of 1.88. He pitched 6 times in the postseason, picking up a save in both the Dodgers' NLDS win over the Atlanta Braves and their loss in the NLCS against the St. Louis Cardinals, although he did give up 2 runs on 5 hits in 2 innings in that latter series after being his typical lights out against the Braves. He was still the Dodgers' closer in 2014, even though the team had three former All-Star closers in its bullpen in Brandon League, Brian Wilson and Chris Perez. The three were now his set-up men, however, and he showed he was the boss on opening day, preserving a 3-1 win over the Arizona Diamondbacks in Sydney, Australia on March 22nd. He was a very busy man in the season's early going, appearing in 15 of the Dodgers' first 22 games, a pace that would have him shatter Mike Marshall's all-time record of 106 appearances in a season, set for the Dodgers in 2014. Manager Don Mattingly was conscious that this was not sustainable, however, and said he would reduce his closer's workload over the rest of the year. He ended up making 68 appearances and saving a career-high 44 games, while striking out 101 batters in 65 1/3 innings. He also recorded a save in his only outing of the postseason, in Game 2 of the NLDS against the Cardinals, but it turned out to be the Dodgers' only win of the series.
Jansen suffered a setback just as spring training was about to open in 2015 as he had to undergo surgery to remove a growth from a bonein his left foot. The operation was expected to put him out of action for two to three months, delaying the start of his season.
Jansen has been compared to the great Mariano Rivera because he too throws an outstanding cutter, a pitch that has been likened to an optical illusion because it does not seem to end up where it appears to be headed.
 Notable Achievements
- 30 Saves Seasons: 1 (2014)
- 40 Saves Seasons: 1 (2014)
- Netherlands Antilles Baseball Federation bio
- 2007 Dodgers Media Guide
- Hawaii Winter League
- World Baseball Classic