As i wrote in my post a few days ago, why you shouldn't bet on the first round of tennis matches, here's a good example.
Medvedev who is ranked number 5 in the world losing to Pospisil who can be considered a journeyman tennis player at best in the first round of the Rotterdam Open.
It wasn't even a close fight with Medvedev never looking like he was really in the game and Pospisil won it comfortably.
When you look at the odds, Medvedev was at 1.20 and Pospisil was at 4.33. Shows how big an upset this was. First round banana-skin avoided. Phew!