BYU vs oSu ratings were 1.66M on Friday, not only the best Fri ESPN late slot rating (10:15pm ET), but also BYU's highest of the year so far.

Friday ESPN Game ratings so far this year

Fri, Aug 30- TCU vs Stanford - 1.49M
Sept 6- No Game at 10:15pm Slot
Sept 13- No Game at 10:15pm Slot (although ESPN game at earlier 7pm ET slot - UNLV vs Kansas had 1.32)
Sept 20- No Game at 10:15pm Slot (ESPN game at earlier 7pm ET slot - Stanford vs Syracuse had 1.37)
Sept 27- No Game at 10:15pm Slot (ESPN game at earlier 7pm ET slot - Va Tech vs Miami had 3.26)

Oct 4- No Game at 10:15pm Slot (ESPN game at earlier 7pm ET slot - Houston vs TCU had 1.51)
Oct 11- Utah vs Arizona St - 1.29M
Oct 18- OK St vs BYU - 1.66M (Of note, TCU vs Utah ESPN matchup on Sat, 19th at 10:15pm ET was 910K)