Either South Carolina or Kentucky.
Kentucky might seem odd to some here, but that was a classic example of a game Tennessee would have lost in 2018. Offense was bad but did just enough to win, and I loved the defensive stops late. That, plus those losses have to be incredibly frustrating to Kentucky fans. They've had really good teams by their standards the last 2 years, especially in 2018, but still have lost to us both years. We're still 10-2 against Kentucky since 2008 - they really "should" be much better than that, especially given that other teams like Vandy and Mizzou have beaten us more often than that since then.