top single-season home run hitters
barry bonds (san francisco giants) — 73 (2001)
mark mcgwire (st. louis cardinals) — 70 (1998)
sammy sosa (chicago cubs) — 66 (1998)
mark mcgwire (st. louis cardinals) — 65 (1999)
sammy sosa (chicago cubs) — 64 (2001)
sammy sosa (chicago cubs) — 63 (1999)
roger maris (new york yankees) — 61 (1961)
babe ruth (new york yankees) — 60 (1927)
babe ruth (new york yankees) — 59 (1921)
mark mcgwire (st. louis cardinals) — 58 (1997)
jimmie foxx (philadelphia phillies) — 58 (1932)
hank greenberg (detroit tigers) — 58 (1938)
luis gonzalez (arizona diamondbacks) — 57 (2001)

— m.