One of the compelling things about tennis is that there are no age or weight classes. Whatever their age, size, weight or reach, the two players compete on a level playing field and bring their individual skill sets to the court.
What made it even funnier is that the two players were dressed identically - white shirt, dark shorts, white baseball cap.
Karlovic, the 35-year-old defending champ in Bogotá, broke into a big smile when he saw Sela head over to get a chair, quickly realizing what he was up to.
There is plenty of photographic evidence of these types of handshakes during Karlovic's long career. Here's one with American Tim Smyczek, who also is listed at 5-9.
Taller isn't always better, though. Smyczek defeated Karlovic 6-4, 7-6(5), 7-5 in their first-round match at the Australian Open last year.
We also look back to the 2008 Australian Open, when someone finally figured out that it would be a stroke of genius to get the two tallest tennis players on the planet, Karlovic and American John Isner, to team up in doubles.
It was kind of disastrous even if they were the most imposing doubles team ever. They lost 7-6, 6-3. And the experiment has not since been repeated.
Another funny tidbit about that: Karlovic had always been listed at 6-10, Isner at 6-9. A couple of years ago Isner declared that he was, in fact, 6-10, which amused Karlovic. Now, Karlovic is listed at 6-11. Hey, if you can be No. 1 in the world at something, you should maximize it.