TOKYO, Japan (Reuters) -World number one Carlos Alcaraz stormed into the semi-finals of the Japan Open on Sunday with a commanding 6-2 6-4 win over American Brandon Nakashima, while Danish third seed Holger Rune was sent packing by Jenson Brooksby. “These kind of matches help to keep my confidence really, really high. To reach the semis in my first appearance is something great.”The biggest upset of the day came in Rune’s 6-3 6-3 loss to American Brooksby, ranked 86th in the world. “Once I get on a roll from a couple of matches, I just think I’m really able to get into my zone. I had never played him before, but I think that’s good maybe, someone who hasn’t faced my unique skills, I guess.