Klizan was able to inflict a shock defeat on Nishikori at 2014’s French Open but at no stage seemed capable of repeating the trick against the Japanese top seed.
Nishikori wrapped up the first set within 28 minutes, and it would have been quicker had he completed the bagel that looked certain until Klizan finally got on the scoreboard when he was five games down.
The world No 5 produced the highlight of the opening set, winning a sublime rally by lofting the ball over Klizan’s head and landing it on the baseline.
Klizan took the first game of the second set by forcing a back-and-forth duel but Nishikori quickly levelled before earning a break of serve to go 2-1 up. The Slovak’s resistance was on the wane, and Nishikori secured back-to-back breaks to go 4-1 ahead.
A powerful serve followed by a delicate drop shot put him a game away from the final, and after Klizan held serve, Nishikori wrapped up his place in Sunday’s final against the winner of the all-Spanish clash between David Ferrer and Pablo Andujar.