Spain's Ferrer, a four-time Auckland champion, disposed of the young Korean 6-3, 6-2 in their quarter-final match to set up a showdown with Juan Martin del Potro in the final four.
Both players will now turn their attention to next week's Australian Open in Melbourne, where Bautista Agut will play compatriot Fernando Verdasco in the first round.
Del Potro had said beforehand he expected Bautista Agut would target his inconsistent backhand, but the Spaniard was also prepared to attack the forehand court when the opportunity presented itself.
The final set remained with serve until Bautista Agut broke at 5-5 and then served for the match. "The end was unbelievable when I saw the ball in I went insane, I was so happy". I've been fighting a lot on the court, and I couldn't believe I was playing my best tennis.
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Speaking on court afterwards, Del Potro, who won the title in Auckland in 2009, said: "I'm exhausted, I'm so glad to be in the final after 10 [nine] years". "We played a great match".
"It's unbelievable to me to be playing tennis again after my wrist problems", Del Potro added. "If I play well maybe I have a little chance". "Roberto started very well". Juan Martin netted a backhand to get broken in game number 2 but he fired up his mighty forehand to get back on the track in the following game, breaking back with a volley victor and reducing the deficit to 2-1. I think I played very aggressive...
Roberto did nothing wrong in the first 8 games either, dropping just 4 points on serve in the opening 4 games, and he served to stay in the set in game 10.
The third set proceeded more swiftly with a series of rapid service games until Haase dropped serve in the fourth game. Bautista broke again in the sixth game to lead 5-1 and comfortably served out the set in a game including his seventh ace.