most home runs
Baseball term used in statistics and records to indicate the highest number of home runs hit by a player or team in a given period.
He recorded the most home runs this season.
Win the title for most home runs.
本塁打 means 'home run' in general, while 最多本塁打 specifically refers to the statistical achievement of having the most home runs.
最多安打 means 'most hits', a similar baseball statistical term.
Compound of 最多 (saita, 'most') + 本塁打 (honruida, 'home run').