Thanks tyke - normally I look at clues I've posted a day later and think, well that stinks, but I did like this one. "Return of serve" was rattling around in my head for a while before it clicked. I'm only sorry there are no actual tennis players whose name begins with U.
Thanks for the clips. I binge-watched all four seasons of Blackadder a few years ago and the last episode's last minute still sticks with me. As for the song, I found it both catchy and prescient in light of the headlines from Ukraine:
Ah-ha this kiss you give
It's never ever going to fade away