I remember taking 5 shots of Captain Morgan before playing a doubles match back in my club college days. We got beaten 1-6, 0-6, serving was a real adventure
I was pretty fucked, swung and missed on more than one forehand
Oddly, smoking cannabis before a match, I have played my best tennis ever while stoned, beating guys I win one and loss one against by the tune of 6-0, 6-2, but also I have played some pretty lethargic tennis while high, and if the match goes to a 3rd, 4th, or 5th, I was fucked. A bit of a crap shoot.