Death Battle Ideas 2

Little Mac vs Makunouchi Ippo

Punch Out vs Hajime no Ippo

Connection:

Both are young boxers who started out as underdogs that were trained by coaches who saw potential in them (Doc Louis and Kamogawa Genji)

Both can punch at fast speeds and have fought against a variety of boxers

Both utilize the Boxer-Puncher boxing style, which prioritize speed and power (Though Ippo is commonly referred as an In-Fighter boxer)