This one is tough to pick because Pella has had a fantastic year. They've only played twice. RBA has won both. Never on grass. They played earlier this year on clay in Munich. They split the first 2 sets then RBA won the third set to love. RBA the accomplished grass court player. Both with the serve and game to do well on the grass. Of course they both sort of lucked into being in the Zverev/Anderson quarter. I thought Raonic would take it over. He fought to the end with Pella. But Pella with the match toughness to finish him off.
Maybe it turns into a war of attrition. At which point it's a tossup. But honestly I do think overall RBA is the cleaner player and should come out on top. He still hasn't dropped a set.
But strangely, Pella has now beaten Copil, Seppi, Anderson, and Raonic, in succession. Those last three all love grass. And 3 of the 4 are giants who have 4 to 6 inches on Pella who have the serve to succeed on grass. Anderson coming back from injury just wasn't ready to go. Clearly. Pella got a little lucky there. Raonic though, while it took 5 sets and 8-6 in the fifth, is a good win. In the end, it really is just that he outlasted him. But he did it. But it's the fact that he beat big servers that might actually mean he's not set to beat RBA. RBA is just a better overall player than any of those 4. And a better player to this point in their careers than Pella. Pella this year has been different. He simply believes more. His coach has helped him find another level. This is not the Pella of the last 5 years. I'm not sure that level is good enough to beat RBA though. He's battled so well this week though. So if he can get a foothold and get a set, he's definitely got a shot to make his first semifinal.
On paper though, of the 4, this one is the tossup. So we'll see.