Poorly-Chosen Metaphor Theater

In a column about the noises made by some female tennis players (which I also find to be obnoxious at times), Sports Illustrated writer Jon Wertheim comes up with this illustration:

Grunting, of course, is not new to tennis. Monica Seles was doing her stuck-pig impersonation in early 1990s, prompting a London tabloid to measure her auditory output.

Really? That's the metaphor you decided to use? Let's review Ms. Seles' career for a moment. She was the best in the world for a time, a strong foil to the dominant Steffi Graf in the later years of Graf's career. Unfortunately, while at the pinnacle of the sport, her career was effectly ended in 1993 by a lunatic. What did deranged Graf fan Gunter Parche do, Mr. Wertheim? Surely you must remember. Oh yes, that's right:

He stabbed Seles in the back with a boning knife while she was on court in the middle of a match.

Stuck pig? Vivid. To be fair, Martina Navratilova originally came up with that imagery, but to refer to it now is just a bit careless.