Dennis won 6 Japan Series titles (2014, 2015, 2017, 2018, 2019, 2020) and was Japan's Saves Leader for three years in a row (2015-2017)
In 2017, Dennis was voted the Pacific League Most Valuable Player, the Japan Series MVP and the winner of the prestigious Shoriki Award. He also saved a record 54 games for the Fukuoka SoftBank Hawks.
Dennis holds the NPB career mark for most saves by a foreigner.