SlangsOnSports Bot , 
Shohei Ohtani in 50 games this season: .354 BA, 13 HR, 13 SB
only other players with .350+ BA, 10+ HR & 10+ SB in their 1st 50 games of a season (since 1900):
2018 Mookie Betts (.352 BA, 18 HR, 13 SB)
2005 Brian Roberts (.368 BA, 11 HR, 13 SB)
1997 Larry Walker (.415 BA, 15 HR, 11 SB)
1958 Willie Mays (.424 BA, 14 HR, 10 SB)