Kazuhiro Sasaki
On September 1, 2010, Feliz threw a fastball recorded at 103.4 mph, currently the 3rd fastest recorded pitch that has ever been thrown (behind Aroldis Chapman and Joel Zumaya). On September 25, 2010, he earned his 38th save of the season, breaking the single-season record for saves by a rookie. He would go on to finish the season with 40. (The previous record was held by Kazuhiro Sasaki of the Seattle Mariners, with 37 in 2000.)