Via the official Twitter account of the New York Yankees …
With 2 K’s in the 8th (131 & 132), @DBetances50 passes Mariano Rivera for #Yankees single-season record for strikeouts as a reliever!
— New York Yankees (@Yankees) September 18, 2014
Rivera had 130 strikeouts in 1996, his second year in the majors and before he became a full-time closer.
Betances boasts a 1.33 ERA, 0.75 WHIP, and 132/24 K/BB ratio in 87 2/3 innings this season for New York.